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13120021 = 167251313
BaseRepresentation
bin110010000011…
…001000010101
3220200120021201
4302003020111
511324320041
61145112501
7216342535
oct62031025
926616251
1013120021
1174512a2
124488731
132944a35
141a574c5
151242631
hexc83215

13120021 has 8 divisors (see below), whose sum is σ = 13293504. Its totient is φ = 12948000.

The previous prime is 13119983. The next prime is 13120057. The reversal of 13120021 is 12002131.

Adding to 13120021 its reverse (12002131), we get a palindrome (25122152).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-13120021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120061) 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, 41761 + ... + 42073.

It is an arithmetic number, because the mean of its divisors is an integer number (1661688).

Almost surely, 213120021 is an apocalyptic number.

It is an amenable number.

13120021 is a deficient number, since it is larger than the sum of its proper divisors (173483).

13120021 is a wasteful number, since it uses less digits than its factorization.

13120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 13120021 is about 3622.1569540814. The cubic root of 13120021 is about 235.8548674359.

The spelling of 13120021 in words is "thirteen million, one hundred twenty thousand, twenty-one".

Divisors: 1 167 251 313 41917 52271 78563 13120021