21121021222112 has 48 divisors (see below), whose sum is σ = 47763527787360. Its totient is φ = 9005917659648.

The previous prime is 21121021222033. The next prime is 21121021222141. The reversal of 21121021222112 is 21122212012112.

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, 239271287 + ... + 239359542.

It is an arithmetic number, because the mean of its divisors is an integer number (995073495570).

Almost surely, 2^{21121021222112} is an apocalyptic number.

It is an amenable number.

21121021222112 is an abundant number, since it is smaller than the sum of its proper divisors (26642506565248).

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

21121021222112 is a wasteful number, since it uses less digits than its factorization.

21121021222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478631043 (or 478631035 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21121021222112 its reverse (21122212012112), we get a palindrome (42243233234224).

The spelling of 21121021222112 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred twelve".