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155434440013021 = 1359202652464163
BaseRepresentation
bin100011010101110111100110…
…100101010011010011011101
3202101100101110101010020001101
4203111313212211103103131
5130333114213120404041
61310325332421513101
744511524215535011
oct4325674645232335
9671311411106041
10155434440013021
11455874152466a4
121552429b572791
136896535466030
142a550d1d42541
1512e8316d62b31
hex8d5de69534dd

155434440013021 has 8 divisors (see below), whose sum is σ = 170228069897760. Its totient is φ = 141046115056752.

The previous prime is 155434440012949. The next prime is 155434440013049. The reversal of 155434440013021 is 120310044434551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155434440013021 - 219 = 155434439488733 is a prime.

It is a super-2 number, since 2×1554344400130212 (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155434440013051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101326231315 + ... + 101326232848.

It is an arithmetic number, because the mean of its divisors is an integer number (21278508737220).

Almost surely, 2155434440013021 is an apocalyptic number.

It is an amenable number.

155434440013021 is a deficient number, since it is larger than the sum of its proper divisors (14793629884739).

155434440013021 is a wasteful number, since it uses less digits than its factorization.

155434440013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202652464235.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 155434440013021 its reverse (120310044434551), we get a palindrome (275744484447572).

The spelling of 155434440013021 in words is "one hundred fifty-five trillion, four hundred thirty-four billion, four hundred forty million, thirteen thousand, twenty-one".

Divisors: 1 13 59 767 202652464163 2634482034119 11956495385617 155434440013021