121755715137 has 60 divisors (see below), whose sum is σ = 216497712816. Its totient is φ = 67956582960.

The previous prime is 121755715121. The next prime is 121755715189. The reversal of 121755715137 is 731517557121.

It is a happy number.

121755715137 is a `hidden beast` number, since 1 + 2 + 1 + 75 + 571 + 5 + 1 + 3 + 7 = 666.

It is not a de Polignac number, because 121755715137 - 2⁴ = 121755715121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121755715092 and 121755715101.

It is not an unprimeable number, because it can be changed into a prime (121755715337) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 186039 + ... + 527372.

Almost surely, 2^121755715137 is an apocalyptic number.

It is an amenable number.

121755715137 is a deficient number, since it is larger than the sum of its proper divisors (94741997679).

121755715137 is an equidigital number, since it uses as much as digits as its factorization.

121755715137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713480 (or 713464 counting only the distinct ones).

The product of its digits is 257250, while the sum is 45.

The spelling of 121755715137 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred fifteen thousand, one hundred thirty-seven".