1213425253521 has 24 divisors (see below), whose sum is σ = 1906239030696. Its totient is φ = 739329926400.

The previous prime is 1213425253511. The next prime is 1213425253571. The reversal of 1213425253521 is 1253525243121.

1213425253521 is a `hidden beast` number, since 1 + 2 + 1 + 34 + 2 + 52 + 53 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 293667531921 + 919757721600 = 541911^2 + 959040^2 .

It is not a de Polignac number, because 1213425253521 - 2⁵ = 1213425253489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213425253511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51330540 + ... + 51354173.

It is an arithmetic number, because the mean of its divisors is an integer number (79426626279).

Almost surely, 2^{1213425253521} is an apocalyptic number.

It is an amenable number.

1213425253521 is a deficient number, since it is larger than the sum of its proper divisors (692813777175).

1213425253521 is a wasteful number, since it uses less digits than its factorization.

1213425253521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102684833 (or 102684830 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The spelling of 1213425253521 in words is "one trillion, two hundred thirteen billion, four hundred twenty-five million, two hundred fifty-three thousand, five hundred twenty-one".