1221112212102 has 32 divisors (see below), whose sum is σ = 2718285679200. Its totient is φ = 406331956224.

The previous prime is 1221112212101. The next prime is 1221112212113. The reversal of 1221112212102 is 2012122111221.

1221112212102 is a `hidden beast` number, since 1 + 221 + 11 + 221 + 210 + 2 = 666.

It is a super-2 number, since 2×1221112212102² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221112212101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19564327 + ... + 19626642.

It is an arithmetic number, because the mean of its divisors is an integer number (84946427475).

Almost surely, 2^{1221112212102} is an apocalyptic number.

1221112212102 is an abundant number, since it is smaller than the sum of its proper divisors (1497173467098).

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

1221112212102 is a wasteful number, since it uses less digits than its factorization.

1221112212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39191557 (or 39191551 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221112212102 its reverse (2012122111221), we get a palindrome (3233234323323).

The spelling of 1221112212102 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred two".