121557531753 has 24 divisors (see below), whose sum is σ = 201225398400. Its totient is φ = 69267947904.

The previous prime is 121557531737. The next prime is 121557531829. The reversal of 121557531753 is 357135755121.

121557531753 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 575 + 3 + 1 + 75 + 3 = 666.

It is not a de Polignac number, because 121557531753 - 2⁴ = 121557531737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121557531699 and 121557531708.

It is not an unprimeable number, because it can be changed into a prime (121557531703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2664688 + ... + 2709921.

It is an arithmetic number, because the mean of its divisors is an integer number (8384391600).

Almost surely, 2^121557531753 is an apocalyptic number.

It is an amenable number.

121557531753 is a deficient number, since it is larger than the sum of its proper divisors (79667866647).

121557531753 is a wasteful number, since it uses less digits than its factorization.

121557531753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5374981 (or 5374978 counting only the distinct ones).

The product of its digits is 551250, while the sum is 45.

The spelling of 121557531753 in words is "one hundred twenty-one billion, five hundred fifty-seven million, five hundred thirty-one thousand, seven hundred fifty-three".