123443621 has 4 divisors (see below), whose sum is σ = 141078432. Its totient is φ = 105808812.

The previous prime is 123443611. The next prime is 123443693. The reversal of 123443621 is 126344321.

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 123443621 - 2¹⁰ = 123442597 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 (123443611) 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, 8817395 + ... + 8817408.

It is an arithmetic number, because the mean of its divisors is an integer number (35269608).

Almost surely, 2^123443621 is an apocalyptic number.

It is an amenable number.

123443621 is a deficient number, since it is larger than the sum of its proper divisors (17634811).

123443621 is an equidigital number, since it uses as much as digits as its factorization.

123443621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17634810.

The product of its digits is 3456, while the sum is 26.

The square root of 123443621 is about 11110.5184847513. The cubic root of 123443621 is about 497.9161552473.

Adding to 123443621 its reverse (126344321), we get a palindrome (249787942).

The spelling of 123443621 in words is "one hundred twenty-three million, four hundred forty-three thousand, six hundred twenty-one".