126321119991 has 24 divisors (see below), whose sum is σ = 199224279696. Its totient is φ = 76491786240.

The previous prime is 126321119987. The next prime is 126321119993. The reversal of 126321119991 is 199911123621.

It is a happy number.

126321119991 is a `hidden beast` number, since 1 + 2 + 632 + 1 + 1 + 1 + 9 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 126321119991 - 2² = 126321119987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126321119993) 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, 439180 + ... + 667473.

It is an arithmetic number, because the mean of its divisors is an integer number (8301011654).

Almost surely, 2^126321119991 is an apocalyptic number.

126321119991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126321119991 is a deficient number, since it is larger than the sum of its proper divisors (72903159705).

126321119991 is a wasteful number, since it uses less digits than its factorization.

126321119991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107823 (or 1107820 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The spelling of 126321119991 in words is "one hundred twenty-six billion, three hundred twenty-one million, one hundred nineteen thousand, nine hundred ninety-one".