21202221201220 has 48 divisors (see below), whose sum is σ = 45159573465216. Its totient is φ = 8359994720000.

The previous prime is 21202221201173. The next prime is 21202221201253. The reversal of 21202221201220 is 2210212220212.

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, 6950475 + ... + 9524365.

It is an arithmetic number, because the mean of its divisors is an integer number (940824447192).

Almost surely, 2^{21202221201220} is an apocalyptic number.

21202221201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202221201220 is an abundant number, since it is smaller than the sum of its proper divisors (23957352263996).

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

21202221201220 is a wasteful number, since it uses less digits than its factorization.

21202221201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579772 (or 2579770 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21202221201220 its reverse (2210212220212), we get a palindrome (23412433421432).

The spelling of 21202221201220 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty".