12126834405 has 80 divisors (see below), whose sum is σ = 25034385024. Its totient is φ = 5501208960.

The previous prime is 12126834371. The next prime is 12126834431. The reversal of 12126834405 is 50443862121.

It is a happy number.

12126834405 is a `hidden beast` number, since 1 + 212 + 6 + 8 + 34 + 405 = 666.

It is not a de Polignac number, because 12126834405 - 2⁷ = 12126834277 is a prime.

It is a super-2 number, since 2×12126834405² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12126834405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 355059 + ... + 387711.

Almost surely, 2^12126834405 is an apocalyptic number.

12126834405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12126834405 is an abundant number, since it is smaller than the sum of its proper divisors (12907550619).

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

12126834405 is a wasteful number, since it uses less digits than its factorization.

12126834405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32808 (or 32799 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 12126834405 in words is "twelve billion, one hundred twenty-six million, eight hundred thirty-four thousand, four hundred five".