21479684625 has 128 divisors (see below), whose sum is σ = 45750681600. Its totient is φ = 9740606400.

The previous prime is 21479684621. The next prime is 21479684647. The reversal of 21479684625 is 52648697412.

21479684625 is a `hidden beast` number, since 2 + 1 + 4 + 7 + 9 + 6 + 8 + 4 + 625 = 666.

It is not a de Polignac number, because 21479684625 - 2² = 21479684621 is a prime.

It is a super-2 number, since 2×21479684625² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479684621) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 2996796 + ... + 3003954.

It is an arithmetic number, because the mean of its divisors is an integer number (357427200).

Almost surely, 2^21479684625 is an apocalyptic number.

21479684625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21479684625 is an abundant number, since it is smaller than the sum of its proper divisors (24270996975).

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

21479684625 is a wasteful number, since it uses less digits than its factorization.

21479684625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317 (or 7301 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 21479684625 in words is "twenty-one billion, four hundred seventy-nine million, six hundred eighty-four thousand, six hundred twenty-five".