21320033004 has 30 divisors (see below), whose sum is σ = 55734778484. Its totient is φ = 7106677560.

The previous prime is 21320032963. The next prime is 21320033027. The reversal of 21320033004 is 40033002312.

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 9 ways as a sum of consecutive naturals, for example, 32900962 + ... + 32901609.

Almost surely, 2^21320033004 is an apocalyptic number.

It is an amenable number.

21320033004 is an abundant number, since it is smaller than the sum of its proper divisors (34414745480).

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

21320033004 is a wasteful number, since it uses less digits than its factorization.

21320033004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65802587 (or 65802576 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21320033004 its reverse (40033002312), we get a palindrome (61353035316).

The spelling of 21320033004 in words is "twenty-one billion, three hundred twenty million, thirty-three thousand, four".