21313220004 has 72 divisors (see below), whose sum is σ = 54504122400. Its totient is φ = 7021765632.

The previous prime is 21313219943. The next prime is 21313220041. The reversal of 21313220004 is 40002231312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1723387 + ... + 1735709.

It is an arithmetic number, because the mean of its divisors is an integer number (757001700).

Almost surely, 2^21313220004 is an apocalyptic number.

It is an amenable number.

21313220004 is an abundant number, since it is smaller than the sum of its proper divisors (33190902396).

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

21313220004 is a wasteful number, since it uses less digits than its factorization.

21313220004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12889 (or 12884 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21313220004 its reverse (40002231312), we get a palindrome (61315451316).

The spelling of 21313220004 in words is "twenty-one billion, three hundred thirteen million, two hundred twenty thousand, four".