21002120202200 has 48 divisors (see below), whose sum is σ = 50020903379160. Its totient is φ = 8195949344000.

The previous prime is 21002120202197. The next prime is 21002120202211. The reversal of 21002120202200 is 220202120012.

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, 1280608886 + ... + 1280625285.

Almost surely, 2^{21002120202200} is an apocalyptic number.

21002120202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002120202200 is an abundant number, since it is smaller than the sum of its proper divisors (29018783176960).

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

21002120202200 is a wasteful number, since it uses less digits than its factorization.

21002120202200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561234228 (or 2561234219 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002120202200 its reverse (220202120012), we get a palindrome (21222322322212).

The spelling of 21002120202200 in words is "twenty-one trillion, two billion, one hundred twenty million, two hundred two thousand, two hundred".