21620603456 has 28 divisors (see below), whose sum is σ = 42921399552. Its totient is φ = 10805762688.

The previous prime is 21620603453. The next prime is 21620603461. The reversal of 21620603456 is 65430602612.

It is a happy number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21620603453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85361 + ... + 224783.

Almost surely, 2^21620603456 is an apocalyptic number.

It is an amenable number.

21620603456 is a deficient number, since it is larger than the sum of its proper divisors (21300796096).

21620603456 is a wasteful number, since it uses less digits than its factorization.

21620603456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141858 (or 141848 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21620603456 in words is "twenty-one billion, six hundred twenty million, six hundred three thousand, four hundred fifty-six".