113421421 has 4 divisors (see below), whose sum is σ = 114590812. Its totient is φ = 112252032.

The previous prime is 113421403. The next prime is 113421439. The reversal of 113421421 is 124124311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124124311 = 2699 ⋅45989.

It is an interprime number because it is at equal distance from previous prime (113421403) and next prime (113421439).

It can be written as a sum of positive squares in 2 ways, for example, as 41409225 + 72012196 = 6435^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 113421421 - 2²⁵ = 79866989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113421521) 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, 584550 + ... + 584743.

It is an arithmetic number, because the mean of its divisors is an integer number (28647703).

Almost surely, 2^113421421 is an apocalyptic number.

It is an amenable number.

113421421 is a deficient number, since it is larger than the sum of its proper divisors (1169391).

113421421 is an equidigital number, since it uses as much as digits as its factorization.

113421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169390.

The product of its digits is 192, while the sum is 19.

The square root of 113421421 is about 10649.9493426025. The cubic root of 113421421 is about 484.0590691857.

Adding to 113421421 its reverse (124124311), we get a palindrome (237545732).

The spelling of 113421421 in words is "one hundred thirteen million, four hundred twenty-one thousand, four hundred twenty-one".