21320031004 has 6 divisors (see below), whose sum is σ = 37310054264. Its totient is φ = 10660015500.

The previous prime is 21320030999. The next prime is 21320031013. The reversal of 21320031004 is 40013002312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665003872 + ... + 2665003879.

Almost surely, 2^21320031004 is an apocalyptic number.

It is an amenable number.

21320031004 is a deficient number, since it is larger than the sum of its proper divisors (15990023260).

21320031004 is a wasteful number, since it uses less digits than its factorization.

21320031004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330007755 (or 5330007753 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21320031004 its reverse (40013002312), we get a palindrome (61333033316).

The spelling of 21320031004 in words is "twenty-one billion, three hundred twenty million, thirty-one thousand, four".