21624377428668 has 48 divisors (see below), whose sum is σ = 57752245666304. Its totient is φ = 6169046495040.

The previous prime is 21624377428627. The next prime is 21624377428769. The reversal of 21624377428668 is 86682477342612.

It is a super-2 number, since 2×21624377428668² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21624377428599 and 21624377428608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194674480 + ... + 194785527.

Almost surely, 2^{21624377428668} is an apocalyptic number.

21624377428668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21624377428668 is an abundant number, since it is smaller than the sum of its proper divisors (36127868237636).

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

21624377428668 is a wasteful number, since it uses less digits than its factorization.

21624377428668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389460682 (or 389460680 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 66.

The spelling of 21624377428668 in words is "twenty-one trillion, six hundred twenty-four billion, three hundred seventy-seven million, four hundred twenty-eight thousand, six hundred sixty-eight".