121516442431 has 4 divisors (see below), whose sum is σ = 121842224152. Its totient is φ = 121190660712.

The previous prime is 121516442417. The next prime is 121516442441. The reversal of 121516442431 is 134244615121.

It is a happy number.

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 121516442431 - 2⁹ = 121516441919 is a prime.

It is a super-2 number, since 2×121516442431² (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 (121516442441) 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, 162890301 + ... + 162891046.

It is an arithmetic number, because the mean of its divisors is an integer number (30460556038).

Almost surely, 2^121516442431 is an apocalyptic number.

121516442431 is a deficient number, since it is larger than the sum of its proper divisors (325781721).

121516442431 is an equidigital number, since it uses as much as digits as its factorization.

121516442431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325781720.

The product of its digits is 23040, while the sum is 34.

The spelling of 121516442431 in words is "one hundred twenty-one billion, five hundred sixteen million, four hundred forty-two thousand, four hundred thirty-one".