21002211012020 has 48 divisors (see below), whose sum is σ = 50479760580480. Its totient is φ = 7190121753984.

The previous prime is 21002211011959. The next prime is 21002211012053. The reversal of 21002211012020 is 2021011220012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21002211011986 and 21002211012004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110699750 + ... + 110889309.

It is an arithmetic number, because the mean of its divisors is an integer number (1051661678760).

Almost surely, 2^{21002211012020} is an apocalyptic number.

21002211012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002211012020 is an abundant number, since it is smaller than the sum of its proper divisors (29477549568460).

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

21002211012020 is a wasteful number, since it uses less digits than its factorization.

21002211012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221589752 (or 221589750 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002211012020 its reverse (2021011220012), we get a palindrome (23023222232032).

The spelling of 21002211012020 in words is "twenty-one trillion, two billion, two hundred eleven million, twelve thousand, twenty".