21507000046155 has 64 divisors (see below), whose sum is σ = 41178111649920. Its totient is φ = 10587465842688.

The previous prime is 21507000046123. The next prime is 21507000046177. The reversal of 21507000046155 is 55164000070512.

It is not a de Polignac number, because 21507000046155 - 2⁵ = 21507000046123 is a prime.

It is a super-2 number, since 2×21507000046155² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31705419 + ... + 32376651.

It is an arithmetic number, because the mean of its divisors is an integer number (643407994530).

Almost surely, 2^{21507000046155} is an apocalyptic number.

21507000046155 is a deficient number, since it is larger than the sum of its proper divisors (19671111603765).

21507000046155 is a wasteful number, since it uses less digits than its factorization.

21507000046155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689517 (or 689511 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 21507000046155 in words is "twenty-one trillion, five hundred seven billion, forty-six thousand, one hundred fifty-five".