123440221 has 4 divisors (see below), whose sum is σ = 124179552. Its totient is φ = 122700892.

The previous prime is 123440167. The next prime is 123440227. The reversal of 123440221 is 122044321.

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 123440221 - 2¹⁷ = 123309149 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 (123440227) 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, 369415 + ... + 369748.

It is an arithmetic number, because the mean of its divisors is an integer number (31044888).

Almost surely, 2^123440221 is an apocalyptic number.

It is an amenable number.

123440221 is a deficient number, since it is larger than the sum of its proper divisors (739331).

123440221 is an equidigital number, since it uses as much as digits as its factorization.

123440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739330.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 123440221 is about 11110.3654755368. The cubic root of 123440221 is about 497.9115838474.

Adding to 123440221 its reverse (122044321), we get a palindrome (245484542).

The spelling of 123440221 in words is "one hundred twenty-three million, four hundred forty thousand, two hundred twenty-one".