21677647225 has 24 divisors (see below), whose sum is σ = 29355746112. Its totient is φ = 15782625600.

The previous prime is 21677647193. The next prime is 21677647231. The reversal of 21677647225 is 52274677612.

It is not a de Polignac number, because 21677647225 - 2⁵ = 21677647193 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 446647 + ... + 492796.

It is an arithmetic number, because the mean of its divisors is an integer number (1223156088).

Almost surely, 2^21677647225 is an apocalyptic number.

21677647225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21677647225 is a deficient number, since it is larger than the sum of its proper divisors (7678098887).

21677647225 is a wasteful number, since it uses less digits than its factorization.

21677647225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939537 (or 939532 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 49.

The spelling of 21677647225 in words is "twenty-one billion, six hundred seventy-seven million, six hundred forty-seven thousand, two hundred twenty-five".