131121231231204 has 60 divisors (see below), whose sum is σ = 342784855737324. Its totient is φ = 43706049762816.

The previous prime is 131121231231203. The next prime is 131121231231259. The reversal of 131121231231204 is 402132132121131.

131121231231204 is a `hidden beast` number, since 1 + 3 + 11 + 21 + 2 + 312 + 312 + 0 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 80292316517604 + 50828914713600 = 8960598^2 + 7129440^2 .

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

It is not an unprimeable number, because it can be changed into a prime (131121231231203) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9112072 + ... + 18581504.

Almost surely, 2^{131121231231204} is an apocalyptic number.

It is an amenable number.

131121231231204 is an abundant number, since it is smaller than the sum of its proper divisors (211663624506120).

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

131121231231204 is a wasteful number, since it uses less digits than its factorization.

131121231231204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9512186 (or 9512175 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 131121231231204 its reverse (402132132121131), we get a palindrome (533253363352335).

The spelling of 131121231231204 in words is "one hundred thirty-one trillion, one hundred twenty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred four".