121398885431 has 4 divisors (see below), whose sum is σ = 121813216392. Its totient is φ = 120984554472.

The previous prime is 121398885401. The next prime is 121398885467. The reversal of 121398885431 is 134588893121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134588893121 = 17 ⋅7916993713.

It is a cyclic number.

It is not a de Polignac number, because 121398885431 - 2⁶ = 121398885367 is a prime.

It is a super-2 number, since 2×121398885431² (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 (121398885401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207165041 + ... + 207165626.

It is an arithmetic number, because the mean of its divisors is an integer number (30453304098).

Almost surely, 2^121398885431 is an apocalyptic number.

121398885431 is a deficient number, since it is larger than the sum of its proper divisors (414330961).

121398885431 is an equidigital number, since it uses as much as digits as its factorization.

121398885431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414330960.

The product of its digits is 1658880, while the sum is 53.

The spelling of 121398885431 in words is "one hundred twenty-one billion, three hundred ninety-eight million, eight hundred eighty-five thousand, four hundred thirty-one".