1215221755992 has 64 divisors (see below), whose sum is σ = 3043361911680. Its totient is φ = 404366595072.

The previous prime is 1215221755933. The next prime is 1215221755997. The reversal of 1215221755992 is 2995571225121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215221755997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73968883 + ... + 73985309.

It is an arithmetic number, because the mean of its divisors is an integer number (47552529870).

Almost surely, 2^{1215221755992} is an apocalyptic number.

1215221755992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215221755992 is an abundant number, since it is smaller than the sum of its proper divisors (1828140155688).

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

1215221755992 is a wasteful number, since it uses less digits than its factorization.

1215221755992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21632 (or 21628 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 51.

The spelling of 1215221755992 in words is "one trillion, two hundred fifteen billion, two hundred twenty-one million, seven hundred fifty-five thousand, nine hundred ninety-two".