123204621 has 4 divisors (see below), whose sum is σ = 164272832. Its totient is φ = 82136412.

The previous prime is 123204617. The next prime is 123204623. The reversal of 123204621 is 126402321.

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 not a de Polignac number, because 123204621 - 2² = 123204617 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 (123204623) 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, 20534101 + ... + 20534106.

It is an arithmetic number, because the mean of its divisors is an integer number (41068208).

Almost surely, 2^123204621 is an apocalyptic number.

It is an amenable number.

123204621 is a deficient number, since it is larger than the sum of its proper divisors (41068211).

123204621 is an equidigital number, since it uses as much as digits as its factorization.

123204621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41068210.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 123204621 is about 11099.7577000581. The cubic root of 123204621 is about 497.5946080692.

Adding to 123204621 its reverse (126402321), we get a palindrome (249606942).

The spelling of 123204621 in words is "one hundred twenty-three million, two hundred four thousand, six hundred twenty-one".