21013400023 has 24 divisors (see below), whose sum is σ = 26491237920. Its totient is φ = 16315622400.

The previous prime is 21013399997. The next prime is 21013400027. The reversal of 21013400023 is 32000431012.

It is a happy number.

It is not a de Polignac number, because 21013400023 - 2¹³ = 21013391831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013400027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193863 + ... + 282151.

It is an arithmetic number, because the mean of its divisors is an integer number (1103801580).

Almost surely, 2^21013400023 is an apocalyptic number.

21013400023 is a deficient number, since it is larger than the sum of its proper divisors (5477837897).

21013400023 is a wasteful number, since it uses less digits than its factorization.

21013400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88599 (or 88588 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21013400023 its reverse (32000431012), we get a palindrome (53013831035).

The spelling of 21013400023 in words is "twenty-one billion, thirteen million, four hundred thousand, twenty-three".