1221133031972 has 24 divisors (see below), whose sum is σ = 2499062951616. Its totient is φ = 511171966368.

The previous prime is 1221133031971. The next prime is 1221133032037. The reversal of 1221133031972 is 2791303311221.

It is not an unprimeable number, because it can be changed into a prime (1221133031971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507113843 + ... + 507116250.

It is an arithmetic number, because the mean of its divisors is an integer number (104127622984).

Almost surely, 2^{1221133031972} is an apocalyptic number.

It is an amenable number.

1221133031972 is an abundant number, since it is smaller than the sum of its proper divisors (1277929919644).

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

1221133031972 is a wasteful number, since it uses less digits than its factorization.

1221133031972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014230147 (or 1014230145 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The spelling of 1221133031972 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, thirty-one thousand, nine hundred seventy-two".