20921285606995 has 32 divisors (see below), whose sum is σ = 28080284705280. Its totient is φ = 14870685335040.

The previous prime is 20921285606983. The next prime is 20921285607007. The reversal of 20921285606995 is 59960658212902.

It is an interprime number because it is at equal distance from previous prime (20921285606983) and next prime (20921285607007).

It is not a de Polignac number, because 20921285606995 - 2¹⁵ = 20921285574227 is a prime.

It is a super-2 number, since 2×20921285606995² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22430511 + ... + 23344600.

It is an arithmetic number, because the mean of its divisors is an integer number (877508897040).

Almost surely, 2^{20921285606995} is an apocalyptic number.

20921285606995 is a deficient number, since it is larger than the sum of its proper divisors (7158999098285).

20921285606995 is a wasteful number, since it uses less digits than its factorization.

20921285606995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45775435.

The product of its (nonzero) digits is 41990400, while the sum is 64.

The spelling of 20921285606995 in words is "twenty trillion, nine hundred twenty-one billion, two hundred eighty-five million, six hundred six thousand, nine hundred ninety-five".