21222201220120 has 64 divisors (see below), whose sum is σ = 48216462174720. Its totient is φ = 8406012142464.

The previous prime is 21222201220019. The next prime is 21222201220147. The reversal of 21222201220120 is 2102210222212.

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, 9158859 + ... + 11239621.

It is an arithmetic number, because the mean of its divisors is an integer number (753382221480).

Almost surely, 2^{21222201220120} is an apocalyptic number.

21222201220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222201220120 is an abundant number, since it is smaller than the sum of its proper divisors (26994260954600).

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

21222201220120 is a wasteful number, since it uses less digits than its factorization.

21222201220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083264 (or 2083260 counting only the distinct ones).

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

Adding to 21222201220120 its reverse (2102210222212), we get a palindrome (23324411442332).

The spelling of 21222201220120 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred twenty thousand, one hundred twenty".