1215438157122 has 64 divisors (see below), whose sum is σ = 2843026222080. Its totient is φ = 339159369024.

The previous prime is 1215438157067. The next prime is 1215438157183. The reversal of 1215438157122 is 2217518345121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23414148 + ... + 23466000.

It is an arithmetic number, because the mean of its divisors is an integer number (44422284720).

Almost surely, 2^{1215438157122} is an apocalyptic number.

1215438157122 is an abundant number, since it is smaller than the sum of its proper divisors (1627588064958).

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

1215438157122 is a wasteful number, since it uses less digits than its factorization.

1215438157122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64887.

The product of its digits is 134400, while the sum is 42.

The spelling of 1215438157122 in words is "one trillion, two hundred fifteen billion, four hundred thirty-eight million, one hundred fifty-seven thousand, one hundred twenty-two".