21655425676 has 6 divisors (see below), whose sum is σ = 37896994940. Its totient is φ = 10827712836.

The previous prime is 21655425647. The next prime is 21655425679. The reversal of 21655425676 is 67652455612.

It is a super-2 number, since 2×21655425676² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21655425679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2706928206 + ... + 2706928213.

Almost surely, 2^21655425676 is an apocalyptic number.

It is an amenable number.

21655425676 is a deficient number, since it is larger than the sum of its proper divisors (16241569264).

21655425676 is a wasteful number, since it uses less digits than its factorization.

21655425676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413856423 (or 5413856421 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 49.

The spelling of 21655425676 in words is "twenty-one billion, six hundred fifty-five million, four hundred twenty-five thousand, six hundred seventy-six".