123100421 has 4 divisors (see below), whose sum is σ = 123292512. Its totient is φ = 122908332.

The previous prime is 123100387. The next prime is 123100423. The reversal of 123100421 is 124001321.

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 123100421 - 2¹⁴ = 123084037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123100396 and 123100405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123100423) 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, 95081 + ... + 96366.

It is an arithmetic number, because the mean of its divisors is an integer number (30823128).

Almost surely, 2^123100421 is an apocalyptic number.

It is an amenable number.

123100421 is a deficient number, since it is larger than the sum of its proper divisors (192091).

123100421 is an equidigital number, since it uses as much as digits as its factorization.

123100421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192090.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 123100421 is about 11095.0629110429. The cubic root of 123100421 is about 497.4542887051.

Adding to 123100421 its reverse (124001321), we get a palindrome (247101742).

The spelling of 123100421 in words is "one hundred twenty-three million, one hundred thousand, four hundred twenty-one".