1213215323265 has 24 divisors (see below), whose sum is σ = 2294079884928. Its totient is φ = 588225611040.

The previous prime is 1213215323261. The next prime is 1213215323329. The reversal of 1213215323265 is 5623235123121.

1213215323265 is a `hidden beast` number, since 1 + 2 + 1 + 32 + 1 + 532 + 32 + 65 = 666.

It is not a de Polignac number, because 1213215323265 - 2² = 1213215323261 is a prime.

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

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 23 ways as a sum of consecutive naturals, for example, 1225469529 + ... + 1225470518.

It is an arithmetic number, because the mean of its divisors is an integer number (95586661872).

Almost surely, 2^{1213215323265} is an apocalyptic number.

1213215323265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213215323265 is a deficient number, since it is larger than the sum of its proper divisors (1080864561663).

1213215323265 is a wasteful number, since it uses less digits than its factorization.

1213215323265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450940069 (or 2450940066 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The spelling of 1213215323265 in words is "one trillion, two hundred thirteen billion, two hundred fifteen million, three hundred twenty-three thousand, two hundred sixty-five".