1221112022012 has 24 divisors (see below), whose sum is σ = 2243209199616. Its totient is φ = 580513023728.

The previous prime is 1221112021999. The next prime is 1221112022017. The reversal of 1221112022012 is 2102202111221.

It is a super-2 number, since 2×1221112022012² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221112022017) 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, 39724028 + ... + 39754755.

It is an arithmetic number, because the mean of its divisors is an integer number (93467049984).

Almost surely, 2^{1221112022012} is an apocalyptic number.

It is an amenable number.

1221112022012 is a deficient number, since it is larger than the sum of its proper divisors (1022097177604).

1221112022012 is a wasteful number, since it uses less digits than its factorization.

1221112022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79478977 (or 79478975 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221112022012 its reverse (2102202111221), we get a palindrome (3323314133233).

The spelling of 1221112022012 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, twenty-two thousand, twelve".