21012303399 has 16 divisors (see below), whose sum is σ = 29674471680. Its totient is φ = 13179726720.

The previous prime is 21012303383. The next prime is 21012303401. The reversal of 21012303399 is 99330321012.

It is not a de Polignac number, because 21012303399 - 2⁴ = 21012303383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012303379) 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, 85734 + ... + 222204.

It is an arithmetic number, because the mean of its divisors is an integer number (1854654480).

Almost surely, 2^21012303399 is an apocalyptic number.

21012303399 is a deficient number, since it is larger than the sum of its proper divisors (8662168281).

21012303399 is a wasteful number, since it uses less digits than its factorization.

21012303399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139510.

The product of its (nonzero) digits is 8748, while the sum is 33.

The spelling of 21012303399 in words is "twenty-one billion, twelve million, three hundred three thousand, three hundred ninety-nine".