121310431 has 32 divisors (see below), whose sum is σ = 142248960. Its totient is φ = 102451200.

The previous prime is 121310429. The next prime is 121310447. The reversal of 121310431 is 134013121.

It is a cyclic number.

It is not a de Polignac number, because 121310431 - 2¹ = 121310429 is a prime.

It is a super-2 number, since 2×121310431² = 29432441338811522, which 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 (121310411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1250575 + ... + 1250671.

It is an arithmetic number, because the mean of its divisors is an integer number (4445280).

Almost surely, 2^121310431 is an apocalyptic number.

121310431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121310431 is a deficient number, since it is larger than the sum of its proper divisors (20938529).

121310431 is a wasteful number, since it uses less digits than its factorization.

121310431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 121310431 is about 11014.1014613086. The cubic root of 121310431 is about 495.0313635197.

Adding to 121310431 its reverse (134013121), we get a palindrome (255323552).

The spelling of 121310431 in words is "one hundred twenty-one million, three hundred ten thousand, four hundred thirty-one".