1213215323264 has 64 divisors (see below), whose sum is σ = 2803458788160. Its totient is φ = 512188959744.

The previous prime is 1213215323261. The next prime is 1213215323329. The reversal of 1213215323264 is 4623235123121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1213215323264² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213215323261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10044707 + ... + 10164770.

It is an arithmetic number, because the mean of its divisors is an integer number (43804043565).

Almost surely, 2^{1213215323264} is an apocalyptic number.

1213215323264 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1213215323264 is an abundant number, since it is smaller than the sum of its proper divisors (1590243464896).

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

1213215323264 is an equidigital number, since it uses as much as digits as its factorization.

1213215323264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20209565 (or 20209553 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The spelling of 1213215323264 in words is "one trillion, two hundred thirteen billion, two hundred fifteen million, three hundred twenty-three thousand, two hundred sixty-four".