21201220220120 has 32 divisors (see below), whose sum is σ = 47725981308720. Its totient is φ = 8476357276800.

The previous prime is 21201220220051. The next prime is 21201220220227. The reversal of 21201220220120 is 2102202210212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129004706 + ... + 129168945.

Almost surely, 2^{21201220220120} is an apocalyptic number.

21201220220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201220220120 is an abundant number, since it is smaller than the sum of its proper divisors (26524761088600).

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

21201220220120 is a wasteful number, since it uses less digits than its factorization.

21201220220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258175715 (or 258175711 counting only the distinct ones).

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

Adding to 21201220220120 its reverse (2102202210212), we get a palindrome (23303422430332).

The spelling of 21201220220120 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty".