1221164777315 has 96 divisors (see below), whose sum is σ = 1906824654720. Its totient is φ = 732539179008.

The previous prime is 1221164777311. The next prime is 1221164777341. The reversal of 1221164777315 is 5137774611221.

It is not a de Polignac number, because 1221164777315 - 2² = 1221164777311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221164777315.

It is not an unprimeable number, because it can be changed into a prime (1221164777311) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 11330501 + ... + 11437769.

It is an arithmetic number, because the mean of its divisors is an integer number (19862756820).

Almost surely, 2^{1221164777315} is an apocalyptic number.

1221164777315 is a deficient number, since it is larger than the sum of its proper divisors (685659877405).

1221164777315 is a wasteful number, since it uses less digits than its factorization.

1221164777315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107389 (or 107370 counting only the distinct ones).

The product of its digits is 493920, while the sum is 47.

The spelling of 1221164777315 in words is "one trillion, two hundred twenty-one billion, one hundred sixty-four million, seven hundred seventy-seven thousand, three hundred fifteen".