21200033100 has 36 divisors (see below), whose sum is σ = 61338763304. Its totient is φ = 5653342080.

The previous prime is 21200033089. The next prime is 21200033131. The reversal of 21200033100 is 133000212.

It is a happy number.

It is a super-2 number, since 2×21200033100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 35333089 + ... + 35333688.

Almost surely, 2^21200033100 is an apocalyptic number.

21200033100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200033100 is an abundant number, since it is smaller than the sum of its proper divisors (40138730204).

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

21200033100 is a wasteful number, since it uses less digits than its factorization.

21200033100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70666794 (or 70666787 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21200033100 its reverse (133000212), we get a palindrome (21333033312).

The spelling of 21200033100 in words is "twenty-one billion, two hundred million, thirty-three thousand, one hundred".