21552303399 has 32 divisors (see below), whose sum is σ = 31882636800. Its totient is φ = 12840643200.

The previous prime is 21552303397. The next prime is 21552303407. The reversal of 21552303399 is 99330325512.

It is not a de Polignac number, because 21552303399 - 2¹ = 21552303397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21552303399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552303397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 804529 + ... + 830885.

It is an arithmetic number, because the mean of its divisors is an integer number (996332400).

Almost surely, 2^21552303399 is an apocalyptic number.

21552303399 is a deficient number, since it is larger than the sum of its proper divisors (10330333401).

21552303399 is a wasteful number, since it uses less digits than its factorization.

21552303399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26791.

The product of its (nonzero) digits is 218700, while the sum is 42.

The spelling of 21552303399 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, three hundred ninety-nine".