21613047876 has 72 divisors (see below), whose sum is σ = 62451480000. Its totient is φ = 6173793216.

The previous prime is 21613047857. The next prime is 21613047889. The reversal of 21613047876 is 67874031612.

21613047876 is a `hidden beast` number, since 21 + 61 + 30 + 478 + 76 = 666.

It is a super-2 number, since 2×21613047876² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1884030 + ... + 1895466.

Almost surely, 2^21613047876 is an apocalyptic number.

It is an amenable number.

21613047876 is an abundant number, since it is smaller than the sum of its proper divisors (40838432124).

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

21613047876 is a wasteful number, since it uses less digits than its factorization.

21613047876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18953 (or 18948 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 21613047876 in words is "twenty-one billion, six hundred thirteen million, forty-seven thousand, eight hundred seventy-six".