1221315150568 has 32 divisors (see below), whose sum is σ = 2314581093000. Its totient is φ = 604111011840.

The previous prime is 1221315150557. The next prime is 1221315150581. The reversal of 1221315150568 is 8650515131221.

It can be written as a sum of positive squares in 4 ways, for example, as 1150131843364 + 71183307204 = 1072442^2 + 266802^2 .

It is a super-2 number, since 2×1221315150568² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221315150568.

It is an unprimeable number.

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, 533553 + ... + 1651456.

Almost surely, 2^{1221315150568} is an apocalyptic number.

It is an amenable number.

1221315150568 is a deficient number, since it is larger than the sum of its proper divisors (1093265942432).

1221315150568 is a wasteful number, since it uses less digits than its factorization.

1221315150568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185765 (or 2185761 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 1221315150568 in words is "one trillion, two hundred twenty-one billion, three hundred fifteen million, one hundred fifty thousand, five hundred sixty-eight".