21202220211020 has 48 divisors (see below), whose sum is σ = 45655656909408. Its totient is φ = 8265868976640.

The previous prime is 21202220211019. The next prime is 21202220211031. The reversal of 21202220211020 is 2011202220212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202220211020.

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, 11931614 + ... + 13592933.

It is an arithmetic number, because the mean of its divisors is an integer number (951159518946).

Almost surely, 2^{21202220211020} is an apocalyptic number.

21202220211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202220211020 is an abundant number, since it is smaller than the sum of its proper divisors (24453436698388).

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

21202220211020 is a wasteful number, since it uses less digits than its factorization.

21202220211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25525610 (or 25525608 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202220211020 its reverse (2011202220212), we get a palindrome (23213422431232).

The spelling of 21202220211020 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, two hundred eleven thousand, twenty".