121557468315431 has 4 divisors (see below), whose sum is σ = 123851005453512. Its totient is φ = 119263931177352.

The previous prime is 121557468315421. The next prime is 121557468315511. The reversal of 121557468315431 is 134513864755121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121557468315431 - 2¹⁰ = 121557468314407 is a prime.

It is a super-2 number, since 2×121557468315431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121557468315421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1146768568961 + ... + 1146768569066.

It is an arithmetic number, because the mean of its divisors is an integer number (30962751363378).

Almost surely, 2^{121557468315431} is an apocalyptic number.

121557468315431 is a deficient number, since it is larger than the sum of its proper divisors (2293537138081).

121557468315431 is an equidigital number, since it uses as much as digits as its factorization.

121557468315431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293537138080.

The product of its digits is 12096000, while the sum is 56.

The spelling of 121557468315431 in words is "one hundred twenty-one trillion, five hundred fifty-seven billion, four hundred sixty-eight million, three hundred fifteen thousand, four hundred thirty-one".