21204102023 has 32 divisors (see below), whose sum is σ = 24554791296. Its totient is φ = 18135871488.

The previous prime is 21204102019. The next prime is 21204102037. The reversal of 21204102023 is 32020140212.

It is a cyclic number.

It is not a de Polignac number, because 21204102023 - 2² = 21204102019 is a prime.

It is a super-2 number, since 2×21204102023² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 21204101992 and 21204102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204152023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13276661 + ... + 13278257.

It is an arithmetic number, because the mean of its divisors is an integer number (767337228).

Almost surely, 2^21204102023 is an apocalyptic number.

21204102023 is a deficient number, since it is larger than the sum of its proper divisors (3350689273).

21204102023 is a wasteful number, since it uses less digits than its factorization.

21204102023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21204102023 its reverse (32020140212), we get a palindrome (53224242235).

The spelling of 21204102023 in words is "twenty-one billion, two hundred four million, one hundred two thousand, twenty-three".