221121011212112 has 40 divisors (see below), whose sum is σ = 482445842656512. Its totient is φ = 97267306982400.

The previous prime is 221121011212109. The next prime is 221121011212117. The reversal of 221121011212112 is 211212110121122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121011212117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20264016833 + ... + 20264027744.

Almost surely, 2^{221121011212112} is an apocalyptic number.

221121011212112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221121011212112 is an abundant number, since it is smaller than the sum of its proper divisors (261324831444400).

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

221121011212112 is a wasteful number, since it uses less digits than its factorization.

221121011212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40528044627 (or 40528044621 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221121011212112 its reverse (211212110121122), we get a palindrome (432333121333234).

The spelling of 221121011212112 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, eleven million, two hundred twelve thousand, one hundred twelve".