21110521023 has 16 divisors (see below), whose sum is σ = 31567138560. Its totient is φ = 13942149048.

The previous prime is 21110521013. The next prime is 21110521039. The reversal of 21110521023 is 32012501112.

It is not a de Polignac number, because 21110521023 - 2⁹ = 21110520511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110520987 and 21110521005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110521013) 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, 3650715 + ... + 3656492.

It is an arithmetic number, because the mean of its divisors is an integer number (1972946160).

Almost surely, 2^21110521023 is an apocalyptic number.

21110521023 is a deficient number, since it is larger than the sum of its proper divisors (10456617537).

21110521023 is a wasteful number, since it uses less digits than its factorization.

21110521023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7307323 (or 7307317 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The spelling of 21110521023 in words is "twenty-one billion, one hundred ten million, five hundred twenty-one thousand, twenty-three".