21013033200 has 120 divisors (see below), whose sum is σ = 67343927808. Its totient is φ = 5600797440.

The previous prime is 21013033177. The next prime is 21013033201. The reversal of 21013033200 is 233031012.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21013033200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013033201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4950279 + ... + 4954521.

Almost surely, 2^21013033200 is an apocalyptic number.

21013033200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013033200 is an abundant number, since it is smaller than the sum of its proper divisors (46330894608).

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

21013033200 is a wasteful number, since it uses less digits than its factorization.

21013033200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8391 (or 8380 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21013033200 its reverse (233031012), we get a palindrome (21246064212).

The spelling of 21013033200 in words is "twenty-one billion, thirteen million, thirty-three thousand, two hundred".