21200102012020 has 24 divisors (see below), whose sum is σ = 46455875714304. Its totient is φ = 8111343378336.

The previous prime is 21200102011999. The next prime is 21200102012039. The reversal of 21200102012020 is 2021020100212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23043588684 + ... + 23043589603.

It is an arithmetic number, because the mean of its divisors is an integer number (1935661488096).

Almost surely, 2^{21200102012020} is an apocalyptic number.

21200102012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200102012020 is an abundant number, since it is smaller than the sum of its proper divisors (25255773702284).

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

21200102012020 is a wasteful number, since it uses less digits than its factorization.

21200102012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46087178319 (or 46087178317 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200102012020 its reverse (2021020100212), we get a palindrome (23221122112232).

The spelling of 21200102012020 in words is "twenty-one trillion, two hundred billion, one hundred two million, twelve thousand, twenty".