221221020202112 has 64 divisors (see below), whose sum is σ = 504220926595200. Its totient is φ = 94705842898944.

The previous prime is 221221020202073. The next prime is 221221020202121. The reversal of 221221020202112 is 211202020122122.

It is a tau number, because it is divible by the number of its divisors (64).

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, 133506533 + ... + 135153380.

It is an arithmetic number, because the mean of its divisors is an integer number (7878451978050).

Almost surely, 2^{221221020202112} is an apocalyptic number.

It is an amenable number.

221221020202112 is an abundant number, since it is smaller than the sum of its proper divisors (282999906393088).

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

221221020202112 is an equidigital number, since it uses as much as digits as its factorization.

221221020202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268660853 (or 268660841 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221221020202112 its reverse (211202020122122), we get a palindrome (432423040324234).

The spelling of 221221020202112 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred two thousand, one hundred twelve".