21620157043625 has 64 divisors (see below), whose sum is σ = 31064688345600. Its totient is φ = 14715690912000.

The previous prime is 21620157043613. The next prime is 21620157043637. The reversal of 21620157043625 is 52634075102612.

It is an interprime number because it is at equal distance from previous prime (21620157043613) and next prime (21620157043637).

It is not a de Polignac number, because 21620157043625 - 2⁸ = 21620157043369 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 193290215 + ... + 193402035.

It is an arithmetic number, because the mean of its divisors is an integer number (485385755400).

Almost surely, 2^{21620157043625} is an apocalyptic number.

21620157043625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21620157043625 is a deficient number, since it is larger than the sum of its proper divisors (9444531301975).

21620157043625 is a wasteful number, since it uses less digits than its factorization.

21620157043625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113475 (or 113465 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21620157043625 in words is "twenty-one trillion, six hundred twenty billion, one hundred fifty-seven million, forty-three thousand, six hundred twenty-five".