21001032304 has 60 divisors (see below), whose sum is σ = 47350991664. Its totient is φ = 8996961792.

The previous prime is 21001032287. The next prime is 21001032317. The reversal of 21001032304 is 40323010012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3891432 + ... + 3896824.

Almost surely, 2^21001032304 is an apocalyptic number.

It is an amenable number.

21001032304 is an abundant number, since it is smaller than the sum of its proper divisors (26349959360).

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

21001032304 is a wasteful number, since it uses less digits than its factorization.

21001032304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10382 (or 10369 counting only the distinct ones).

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

Adding to 21001032304 its reverse (40323010012), we get a palindrome (61324042316).

The spelling of 21001032304 in words is "twenty-one billion, one million, thirty-two thousand, three hundred four".