1221112012212 has 72 divisors (see below), whose sum is σ = 3091488254400. Its totient is φ = 406406325888.

The previous prime is 1221112012199. The next prime is 1221112012223. The reversal of 1221112012212 is 2122102111221.

It is a super-2 number, since 2×1221112012212² (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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83993008 + ... + 84007544.

Almost surely, 2^{1221112012212} is an apocalyptic number.

1221112012212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221112012212 is an abundant number, since it is smaller than the sum of its proper divisors (1870376242188).

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

1221112012212 is a wasteful number, since it uses less digits than its factorization.

1221112012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18005 (or 18000 counting only the distinct ones).

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

Adding to 1221112012212 its reverse (2122102111221), we get a palindrome (3343214123433).

Subtracting 1221112012212 from its reverse (2122102111221), we obtain a palindrome (900990099009).

The spelling of 1221112012212 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, twelve thousand, two hundred twelve".