21132020210020 has 48 divisors (see below), whose sum is σ = 45108547243200. Its totient is φ = 8313535336320.

The previous prime is 21132020209999. The next prime is 21132020210023. The reversal of 21132020210020 is 2001202023112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21132020209976 and 21132020210003.

It is not an unprimeable number, because it can be changed into a prime (21132020210023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13840171 + ... + 15290989.

It is an arithmetic number, because the mean of its divisors is an integer number (939761400900).

Almost surely, 2^{21132020210020} is an apocalyptic number.

21132020210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132020210020 is an abundant number, since it is smaller than the sum of its proper divisors (23976527033180).

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

21132020210020 is a wasteful number, since it uses less digits than its factorization.

21132020210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462828 (or 1462826 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21132020210020 its reverse (2001202023112), we get a palindrome (23133222233132).

The spelling of 21132020210020 in words is "twenty-one trillion, one hundred thirty-two billion, twenty million, two hundred ten thousand, twenty".