111421431 has 12 divisors (see below), whose sum is σ = 175573320. Its totient is φ = 67528080.

The previous prime is 111421411. The next prime is 111421447. The reversal of 111421431 is 134124111.

It is not a de Polignac number, because 111421431 - 2⁵ = 111421399 is a prime.

It is a super-2 number, since 2×111421431² = 24829470572175522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111421411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562636 + ... + 562833.

It is an arithmetic number, because the mean of its divisors is an integer number (14631110).

Almost surely, 2^111421431 is an apocalyptic number.

111421431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111421431 is a deficient number, since it is larger than the sum of its proper divisors (64151889).

111421431 is a wasteful number, since it uses less digits than its factorization.

111421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125486 (or 1125483 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 111421431 is about 10555.6350353733. The cubic root of 111421431 is about 481.1969994817.

Adding to 111421431 its reverse (134124111), we get a palindrome (245545542).

The spelling of 111421431 in words is "one hundred eleven million, four hundred twenty-one thousand, four hundred thirty-one".