12215521413 has 16 divisors (see below), whose sum is σ = 18103780800. Its totient is φ = 8140660560.

The previous prime is 12215521397. The next prime is 12215521453. The reversal of 12215521413 is 31412551221.

It is a happy number.

12215521413 is a `hidden beast` number, since 1 + 221 + 5 + 5 + 21 + 413 = 666.

It is not a de Polignac number, because 12215521413 - 2⁴ = 12215521397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215521453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8523 + ... + 156536.

It is an arithmetic number, because the mean of its divisors is an integer number (1131486300).

Almost surely, 2^12215521413 is an apocalyptic number.

It is an amenable number.

12215521413 is a deficient number, since it is larger than the sum of its proper divisors (5888259387).

12215521413 is a wasteful number, since it uses less digits than its factorization.

12215521413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167809 (or 167803 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The spelling of 12215521413 in words is "twelve billion, two hundred fifteen million, five hundred twenty-one thousand, four hundred thirteen".