121531455653 has 16 divisors (see below), whose sum is σ = 125039635200. Its totient is φ = 118076031360.

The previous prime is 121531455611. The next prime is 121531455667. The reversal of 121531455653 is 356554135121.

It is a cyclic number.

It is not a de Polignac number, because 121531455653 - 2²⁰ = 121530407077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121531455653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531455673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6360368 + ... + 6379446.

It is an arithmetic number, because the mean of its divisors is an integer number (7814977200).

Almost surely, 2^121531455653 is an apocalyptic number.

It is an amenable number.

121531455653 is a deficient number, since it is larger than the sum of its proper divisors (3508179547).

121531455653 is a wasteful number, since it uses less digits than its factorization.

121531455653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20452.

The product of its digits is 270000, while the sum is 41.

The spelling of 121531455653 in words is "one hundred twenty-one billion, five hundred thirty-one million, four hundred fifty-five thousand, six hundred fifty-three".