124238921 has 2 divisors, whose sum is σ = 124238922. Its totient is φ = 124238920.

The previous prime is 124238887. The next prime is 124238923. The reversal of 124238921 is 129832421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73273600 + 50965321 = 8560^2 + 7139^2 .

It is an emirp because it is prime and its reverse (129832421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124238921 - 2⁶ = 124238857 is a prime.

It is a Sophie Germain prime.

Together with 124238923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (124238923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62119460 + 62119461.

It is an arithmetic number, because the mean of its divisors is an integer number (62119461).

Almost surely, 2^124238921 is an apocalyptic number.

It is an amenable number.

124238921 is a deficient number, since it is larger than the sum of its proper divisors (1).

124238921 is an equidigital number, since it uses as much as digits as its factorization.

124238921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 124238921 is about 11146.2514326566. The cubic root of 124238921 is about 498.9831614807.

The spelling of 124238921 in words is "one hundred twenty-four million, two hundred thirty-eight thousand, nine hundred twenty-one".