21054779696 has 40 divisors (see below), whose sum is σ = 40931130240. Its totient is φ = 10491969024.

The previous prime is 21054779657. The next prime is 21054779747. The reversal of 21054779696 is 69697745012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11968865 + ... + 11970623.

It is an arithmetic number, because the mean of its divisors is an integer number (1023278256).

Almost surely, 2^21054779696 is an apocalyptic number.

It is an amenable number.

21054779696 is a deficient number, since it is larger than the sum of its proper divisors (19876350544).

21054779696 is a wasteful number, since it uses less digits than its factorization.

21054779696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861 (or 3855 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 21054779696 in words is "twenty-one billion, fifty-four million, seven hundred seventy-nine thousand, six hundred ninety-six".