21161016776 has 16 divisors (see below), whose sum is σ = 39678614640. Its totient is φ = 10580052880.

The previous prime is 21161016763. The next prime is 21161016787. The reversal of 21161016776 is 67761016112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219371 + ... + 300741.

It is an arithmetic number, because the mean of its divisors is an integer number (2479913415).

Almost surely, 2^21161016776 is an apocalyptic number.

It is an amenable number.

21161016776 is a deficient number, since it is larger than the sum of its proper divisors (18517597864).

21161016776 is a wasteful number, since it uses less digits than its factorization.

21161016776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113884 (or 113880 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 21161016776 in words is "twenty-one billion, one hundred sixty-one million, sixteen thousand, seven hundred seventy-six".