21314532399 has 16 divisors (see below), whose sum is σ = 28963059840. Its totient is φ = 13938880160.

The previous prime is 21314532373. The next prime is 21314532401. The reversal of 21314532399 is 99323541312.

It is a cyclic number.

It is not a de Polignac number, because 21314532399 - 2²⁵ = 21280977967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21314532399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314532299) 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, 46272 + ... + 211589.

It is an arithmetic number, because the mean of its divisors is an integer number (1810191240).

Almost surely, 2^21314532399 is an apocalyptic number.

21314532399 is a deficient number, since it is larger than the sum of its proper divisors (7648527441).

21314532399 is a wasteful number, since it uses less digits than its factorization.

21314532399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258390.

The product of its digits is 174960, while the sum is 42.

The spelling of 21314532399 in words is "twenty-one billion, three hundred fourteen million, five hundred thirty-two thousand, three hundred ninety-nine".