113421221 has 4 divisors (see below), whose sum is σ = 113446944. Its totient is φ = 113395500.

The previous prime is 113421193. The next prime is 113421271. The reversal of 113421221 is 122124311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122124311 = 17 ⋅7183783.

It is a cyclic number.

It is not a de Polignac number, because 113421221 - 2¹⁸ = 113159077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 113421221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113421271) 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, 4385 + ... + 15686.

It is an arithmetic number, because the mean of its divisors is an integer number (28361736).

Almost surely, 2^113421221 is an apocalyptic number.

It is an amenable number.

113421221 is a deficient number, since it is larger than the sum of its proper divisors (25723).

113421221 is an equidigital number, since it uses as much as digits as its factorization.

113421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25722.

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

The square root of 113421221 is about 10649.9399528824. The cubic root of 113421221 is about 484.0587846661.

Adding to 113421221 its reverse (122124311), we get a palindrome (235545532).

The spelling of 113421221 in words is "one hundred thirteen million, four hundred twenty-one thousand, two hundred twenty-one".