124722921 has 4 divisors (see below), whose sum is σ = 166297232. Its totient is φ = 83148612.

The previous prime is 124722907. The next prime is 124722947. The reversal of 124722921 is 129227421.

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 124722921 - 2¹¹ = 124720873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124722971) 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, 20787151 + ... + 20787156.

It is an arithmetic number, because the mean of its divisors is an integer number (41574308).

Almost surely, 2^124722921 is an apocalyptic number.

It is an amenable number.

124722921 is a deficient number, since it is larger than the sum of its proper divisors (41574311).

124722921 is an equidigital number, since it uses as much as digits as its factorization.

124722921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41574310.

The product of its digits is 4032, while the sum is 30.

The square root of 124722921 is about 11167.9416635296. The cubic root of 124722921 is about 499.6302880268.

The spelling of 124722921 in words is "one hundred twenty-four million, seven hundred twenty-two thousand, nine hundred twenty-one".