124137921 has 4 divisors (see below), whose sum is σ = 165517232. Its totient is φ = 82758612.

The previous prime is 124137911. The next prime is 124137929. The reversal of 124137921 is 129731421.

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 124137921 - 2¹⁸ = 123875777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124137929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20689651 + ... + 20689656.

It is an arithmetic number, because the mean of its divisors is an integer number (41379308).

Almost surely, 2^124137921 is an apocalyptic number.

It is an amenable number.

124137921 is a deficient number, since it is larger than the sum of its proper divisors (41379311).

124137921 is an equidigital number, since it uses as much as digits as its factorization.

124137921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41379310.

The product of its digits is 3024, while the sum is 30.

The square root of 124137921 is about 11141.7198403119. The cubic root of 124137921 is about 498.8479087437.

The spelling of 124137921 in words is "one hundred twenty-four million, one hundred thirty-seven thousand, nine hundred twenty-one".