121525963391 has 8 divisors (see below), whose sum is σ = 139087814784. Its totient is φ = 104014361880.

The previous prime is 121525963379. The next prime is 121525963399. The reversal of 121525963391 is 193369525121.

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

It is a cyclic number.

It is not a de Polignac number, because 121525963391 - 2³⁰ = 120452221567 is a prime.

It is a super-2 number, since 2×121525963391² (a number of 23 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 (121525963399) 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 7 ways as a sum of consecutive naturals, for example, 12557285 + ... + 12566958.

It is an arithmetic number, because the mean of its divisors is an integer number (17385976848).

Almost surely, 2^121525963391 is an apocalyptic number.

121525963391 is a deficient number, since it is larger than the sum of its proper divisors (17561851393).

121525963391 is an equidigital number, since it uses as much as digits as its factorization.

121525963391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25124941.

The product of its digits is 437400, while the sum is 47.

The spelling of 121525963391 in words is "one hundred twenty-one billion, five hundred twenty-five million, nine hundred sixty-three thousand, three hundred ninety-one".