126873378621 has 32 divisors (see below), whose sum is σ = 210589737600. Its totient is φ = 74814762240.

The previous prime is 126873378613. The next prime is 126873378631.

It is a happy number.

126873378621 is a `hidden beast` number, since 1 + 2 + 6 + 8 + 7 + 3 + 3 + 7 + 8 + 621 = 666.

126873378621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 126873378621 - 2³ = 126873378613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126873378631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5761756 + ... + 5783733.

It is an arithmetic number, because the mean of its divisors is an integer number (6580929300).

Almost surely, 2^126873378621 is an apocalyptic number.

126873378621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126873378621 is a deficient number, since it is larger than the sum of its proper divisors (83716358979).

126873378621 is a wasteful number, since it uses less digits than its factorization.

126873378621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11545546 (or 11545540 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The spelling of 126873378621 in words is "one hundred twenty-six billion, eight hundred seventy-three million, three hundred seventy-eight thousand, six hundred twenty-one".