1213555313223 has 48 divisors (see below), whose sum is σ = 1952718857856. Its totient is φ = 720065142720.

The previous prime is 1213555313209. The next prime is 1213555313249. The reversal of 1213555313223 is 3223135553121.

1213555313223 is a `hidden beast` number, since 1 + 21 + 3 + 55 + 531 + 32 + 23 = 666.

It is not a de Polignac number, because 1213555313223 - 2⁴ = 1213555313207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213555313623) 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 47 ways as a sum of consecutive naturals, for example, 519961 + ... + 1642397.

It is an arithmetic number, because the mean of its divisors is an integer number (40681642872).

Almost surely, 2^{1213555313223} is an apocalyptic number.

1213555313223 is a deficient number, since it is larger than the sum of its proper divisors (739163544633).

1213555313223 is a wasteful number, since it uses less digits than its factorization.

1213555313223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122684 (or 1122681 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The spelling of 1213555313223 in words is "one trillion, two hundred thirteen billion, five hundred fifty-five million, three hundred thirteen thousand, two hundred twenty-three".