20873575351521 has 48 divisors (see below), whose sum is σ = 31077213228672. Its totient is φ = 13494689683200.

The previous prime is 20873575351511. The next prime is 20873575351561. The reversal of 20873575351521 is 12515357537802.

20873575351521 is a `hidden beast` number, since 2 + 0 + 8 + 7 + 3 + 57 + 53 + 515 + 21 = 666.

It is not a de Polignac number, because 20873575351521 - 2⁶ = 20873575351457 is a prime.

It is a super-2 number, since 2×20873575351521² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20873575351511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101331996 + ... + 101537778.

It is an arithmetic number, because the mean of its divisors is an integer number (647441942264).

Almost surely, 2^{20873575351521} is an apocalyptic number.

It is an amenable number.

20873575351521 is a deficient number, since it is larger than the sum of its proper divisors (10203637877151).

20873575351521 is a wasteful number, since it uses less digits than its factorization.

20873575351521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208454 (or 208451 counting only the distinct ones).

The product of its (nonzero) digits is 8820000, while the sum is 54.

The spelling of 20873575351521 in words is "twenty trillion, eight hundred seventy-three billion, five hundred seventy-five million, three hundred fifty-one thousand, five hundred twenty-one".