121831606404 has 36 divisors (see below), whose sum is σ = 318582651660. Its totient is φ = 39210171840.

The previous prime is 121831606381. The next prime is 121831606469. The reversal of 121831606404 is 404606138121.

121831606404 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 3 + 1 + 6 + 0 + 640 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56782124100 + 65049482304 = 238290^2 + 255048^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×121831606404² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58347427 + ... + 58349514.

Almost surely, 2^121831606404 is an apocalyptic number.

It is an amenable number.

121831606404 is an abundant number, since it is smaller than the sum of its proper divisors (196751045256).

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

121831606404 is a wasteful number, since it uses less digits than its factorization.

121831606404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116696980 (or 116696975 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 121831606404 in words is "one hundred twenty-one billion, eight hundred thirty-one million, six hundred six thousand, four hundred four".