21313331304 has 16 divisors (see below), whose sum is σ = 53283328320. Its totient is φ = 7104443760.

The previous prime is 21313331293. The next prime is 21313331321. The reversal of 21313331304 is 40313331312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 888055471 = 21313331304 / (2 + 1 + 3 + 1 + 3 + 3 + 3 + 1 + 3 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444027712 + ... + 444027759.

It is an arithmetic number, because the mean of its divisors is an integer number (3330208020).

Almost surely, 2^21313331304 is an apocalyptic number.

21313331304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21313331304 is an abundant number, since it is smaller than the sum of its proper divisors (31969997016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21313331304 is a wasteful number, since it uses less digits than its factorization.

21313331304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888055480 (or 888055476 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 21313331304 its reverse (40313331312), we get a palindrome (61626662616).

The spelling of 21313331304 in words is "twenty-one billion, three hundred thirteen million, three hundred thirty-one thousand, three hundred four".