21002133320 has 32 divisors (see below), whose sum is σ = 54005486400. Its totient is φ = 7200731328.

The previous prime is 21002133293. The next prime is 21002133323. The reversal of 21002133320 is 2333120012.

It is not an unprimeable number, because it can be changed into a prime (21002133323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37503530 + ... + 37504089.

It is an arithmetic number, because the mean of its divisors is an integer number (1687671450).

Almost surely, 2^21002133320 is an apocalyptic number.

21002133320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002133320 is an abundant number, since it is smaller than the sum of its proper divisors (33003353080).

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

21002133320 is a wasteful number, since it uses less digits than its factorization.

21002133320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75007637 (or 75007633 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21002133320 its reverse (2333120012), we get a palindrome (23335253332).

The spelling of 21002133320 in words is "twenty-one billion, two million, one hundred thirty-three thousand, three hundred twenty".