21612577072025 has 12 divisors (see below), whose sum is σ = 26799653356752. Its totient is φ = 17290024375440.

The previous prime is 21612577071983. The next prime is 21612577072033. The reversal of 21612577072025 is 52027077521612.

It is not a de Polignac number, because 21612577072025 - 2¹⁸ = 21612576809881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21178154 + ... + 22175196.

It is an arithmetic number, because the mean of its divisors is an integer number (2233304446396).

Almost surely, 2^{21612577072025} is an apocalyptic number.

21612577072025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21612577072025 is a deficient number, since it is larger than the sum of its proper divisors (5187076284727).

21612577072025 is an equidigital number, since it uses as much as digits as its factorization.

21612577072025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864120 (or 1864115 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 47.

The spelling of 21612577072025 in words is "twenty-one trillion, six hundred twelve billion, five hundred seventy-seven million, seventy-two thousand, twenty-five".