21103656023 has 16 divisors (see below), whose sum is σ = 21380785920. Its totient is φ = 20828930304.

The previous prime is 21103656019. The next prime is 21103656083. The reversal of 21103656023 is 32065630112.

It is a cyclic number.

It is not a de Polignac number, because 21103656023 - 2² = 21103656019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103656083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19307465 + ... + 19308557.

It is an arithmetic number, because the mean of its divisors is an integer number (1336299120).

Almost surely, 2^21103656023 is an apocalyptic number.

21103656023 is a deficient number, since it is larger than the sum of its proper divisors (277129897).

21103656023 is a wasteful number, since it uses less digits than its factorization.

21103656023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 21103656023 in words is "twenty-one billion, one hundred three million, six hundred fifty-six thousand, twenty-three".