123244021 has 4 divisors (see below), whose sum is σ = 125083552. Its totient is φ = 121404492.

The previous prime is 123244007. The next prime is 123244031. The reversal of 123244021 is 120442321.

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: 120442321 = 229 ⋅525949.

It is a cyclic number.

It is not a de Polignac number, because 123244021 - 2⁷ = 123243893 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 123244021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123244031) 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, 919665 + ... + 919798.

It is an arithmetic number, because the mean of its divisors is an integer number (31270888).

Almost surely, 2^123244021 is an apocalyptic number.

It is an amenable number.

123244021 is a deficient number, since it is larger than the sum of its proper divisors (1839531).

123244021 is an equidigital number, since it uses as much as digits as its factorization.

123244021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839530.

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

The square root of 123244021 is about 11101.5323717044. The cubic root of 123244021 is about 497.6476448733.

Adding to 123244021 its reverse (120442321), we get a palindrome (243686342).

The spelling of 123244021 in words is "one hundred twenty-three million, two hundred forty-four thousand, twenty-one".