21421614601656 has 96 divisors (see below), whose sum is σ = 61430822191440. Its totient is φ = 6720376126464.

The previous prime is 21421614601601. The next prime is 21421614601697. The reversal of 21421614601656 is 65610641612412.

21421614601656 is a `hidden beast` number, since 2 + 1 + 4 + 21 + 6 + 1 + 460 + 165 + 6 = 666.

It is a congruent 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, 77398590 + ... + 77674866.

Almost surely, 2^{21421614601656} is an apocalyptic number.

It is an amenable number.

21421614601656 is an abundant number, since it is smaller than the sum of its proper divisors (40009207589784).

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

21421614601656 is a wasteful number, since it uses less digits than its factorization.

21421614601656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339653 (or 339646 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 21421614601656 in words is "twenty-one trillion, four hundred twenty-one billion, six hundred fourteen million, six hundred one thousand, six hundred fifty-six".