21155236246151 has 16 divisors (see below), whose sum is σ = 24278653009920. Its totient is φ = 18057171179520.

The previous prime is 21155236246097. The next prime is 21155236246223. The reversal of 21155236246151 is 15164263255112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21155236246151 - 2²⁶ = 21155169137287 is a prime.

It is a super-2 number, since 2×21155236246151² (a number of 27 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 (21155236246051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4366490 + ... + 7834328.

It is an arithmetic number, because the mean of its divisors is an integer number (1517415813120).

Almost surely, 2^{21155236246151} is an apocalyptic number.

21155236246151 is a deficient number, since it is larger than the sum of its proper divisors (3123416763769).

21155236246151 is a wasteful number, since it uses less digits than its factorization.

21155236246151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471494.

The product of its digits is 432000, while the sum is 44.

The spelling of 21155236246151 in words is "twenty-one trillion, one hundred fifty-five billion, two hundred thirty-six million, two hundred forty-six thousand, one hundred fifty-one".