121350155521 has 16 divisors (see below), whose sum is σ = 143765352576. Its totient is φ = 100257371136.

The previous prime is 121350155513. The next prime is 121350155533. The reversal of 121350155521 is 125551053121.

It is a cyclic number.

It is not a de Polignac number, because 121350155521 - 2³ = 121350155513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121350155621) 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, 2161696 + ... + 2217121.

It is an arithmetic number, because the mean of its divisors is an integer number (8985334536).

Almost surely, 2^121350155521 is an apocalyptic number.

It is an amenable number.

121350155521 is a deficient number, since it is larger than the sum of its proper divisors (22415197055).

121350155521 is a wasteful number, since it uses less digits than its factorization.

121350155521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378968.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 121350155521 in words is "one hundred twenty-one billion, three hundred fifty million, one hundred fifty-five thousand, five hundred twenty-one".