113144021 has 4 divisors (see below), whose sum is σ = 113192352. Its totient is φ = 113095692.

The previous prime is 113143999. The next prime is 113144033. The reversal of 113144021 is 120441311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 113144021 - 2¹⁸ = 112881877 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 (113144041) 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, 20465 + ... + 25398.

It is an arithmetic number, because the mean of its divisors is an integer number (28298088).

Almost surely, 2^113144021 is an apocalyptic number.

It is an amenable number.

113144021 is a deficient number, since it is larger than the sum of its proper divisors (48331).

113144021 is an equidigital number, since it uses as much as digits as its factorization.

113144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48330.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 113144021 is about 10636.9178336584. The cubic root of 113144021 is about 483.6641184979.

Adding to 113144021 its reverse (120441311), we get a palindrome (233585332).

The spelling of 113144021 in words is "one hundred thirteen million, one hundred forty-four thousand, twenty-one".