21344304399 has 32 divisors (see below), whose sum is σ = 31162005504. Its totient is φ = 12887827680.

The previous prime is 21344304391. The next prime is 21344304461. The reversal of 21344304399 is 99340344312.

It is not a de Polignac number, because 21344304399 - 2³ = 21344304391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21344304399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344304391) 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, 14391912 + ... + 14393394.

It is an arithmetic number, because the mean of its divisors is an integer number (973812672).

Almost surely, 2^21344304399 is an apocalyptic number.

21344304399 is a deficient number, since it is larger than the sum of its proper divisors (9817701105).

21344304399 is a wasteful number, since it uses less digits than its factorization.

21344304399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827.

The product of its (nonzero) digits is 279936, while the sum is 42.

The spelling of 21344304399 in words is "twenty-one billion, three hundred forty-four million, three hundred four thousand, three hundred ninety-nine".