21535422876 has 72 divisors (see below), whose sum is σ = 59741345664. Its totient is φ = 6486788640.

The previous prime is 21535422863. The next prime is 21535422901. The reversal of 21535422876 is 67822453512.

21535422876 is a `hidden beast` number, since 2 + 1 + 5 + 354 + 228 + 76 = 666.

It is a super-2 number, since 2×21535422876² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96690 + ... + 228953.

It is an arithmetic number, because the mean of its divisors is an integer number (829740912).

Almost surely, 2^21535422876 is an apocalyptic number.

It is an amenable number.

21535422876 is an abundant number, since it is smaller than the sum of its proper divisors (38205922788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21535422876 is a wasteful number, since it uses less digits than its factorization.

21535422876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325831 (or 325826 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 21535422876 in words is "twenty-one billion, five hundred thirty-five million, four hundred twenty-two thousand, eight hundred seventy-six".