21652420353656 has 32 divisors (see below), whose sum is σ = 40607748403200. Its totient is φ = 10823687814240.

The previous prime is 21652420353649. The next prime is 21652420353671. The reversal of 21652420353656 is 65635302425612.

It is a happy number.

It is a super-2 number, since 2×21652420353656² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854362121 + ... + 854387463.

It is an arithmetic number, because the mean of its divisors is an integer number (1268992137600).

Almost surely, 2^{21652420353656} is an apocalyptic number.

It is an amenable number.

21652420353656 is a deficient number, since it is larger than the sum of its proper divisors (18955328049544).

21652420353656 is a wasteful number, since it uses less digits than its factorization.

21652420353656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46019 (or 46015 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 21652420353656 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred twenty million, three hundred fifty-three thousand, six hundred fifty-six".