121542815669493 has 8 divisors (see below), whose sum is σ = 162729523608256. Its totient is φ = 80692325755200.

The previous prime is 121542815669479. The next prime is 121542815669501. The reversal of 121542815669493 is 394966518245121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121542815669493 - 2²⁰ = 121542814620917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121542815669893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84054505273 + ... + 84054506718.

It is an arithmetic number, because the mean of its divisors is an integer number (20341190451032).

Almost surely, 2^{121542815669493} is an apocalyptic number.

It is an amenable number.

121542815669493 is a deficient number, since it is larger than the sum of its proper divisors (41186707938763).

121542815669493 is a wasteful number, since it uses less digits than its factorization.

121542815669493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168109012235.

The product of its digits is 111974400, while the sum is 66.

The spelling of 121542815669493 in words is "one hundred twenty-one trillion, five hundred forty-two billion, eight hundred fifteen million, six hundred sixty-nine thousand, four hundred ninety-three".