121457395539 has 12 divisors (see below), whose sum is σ = 181936181336. Its totient is φ = 80971596864.

The previous prime is 121457395517. The next prime is 121457395627. The reversal of 121457395539 is 935593754121.

It is a happy number.

121457395539 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 57 + 39 + 553 + 9 = 666.

It is not a de Polignac number, because 121457395539 - 2²⁴ = 121440618323 is a prime.

It is a super-2 number, since 2×121457395539² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121457395639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249912094 + ... + 249912579.

Almost surely, 2^121457395539 is an apocalyptic number.

121457395539 is a deficient number, since it is larger than the sum of its proper divisors (60478785797).

121457395539 is an frugal number, since it uses more digits than its factorization.

121457395539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499824688 (or 499824676 counting only the distinct ones).

The product of its digits is 5103000, while the sum is 54.

The spelling of 121457395539 in words is "one hundred twenty-one billion, four hundred fifty-seven million, three hundred ninety-five thousand, five hundred thirty-nine".