124153021 has 4 divisors (see below), whose sum is σ = 124338172. Its totient is φ = 123967872.

The previous prime is 124153013. The next prime is 124153027. The reversal of 124153021 is 120351421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120351421 = 29 ⋅4150049.

It can be written as a sum of positive squares in 2 ways, for example, as 49140100 + 75012921 = 7010^2 + 8661^2 .

It is a cyclic number.

It is not a de Polignac number, because 124153021 - 2³ = 124153013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 124153021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124153027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91566 + ... + 92911.

It is an arithmetic number, because the mean of its divisors is an integer number (31084543).

Almost surely, 2^124153021 is an apocalyptic number.

It is an amenable number.

124153021 is a deficient number, since it is larger than the sum of its proper divisors (185151).

124153021 is an equidigital number, since it uses as much as digits as its factorization.

124153021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185150.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 124153021 is about 11142.3974529721. The cubic root of 124153021 is about 498.8681343604.

The spelling of 124153021 in words is "one hundred twenty-four million, one hundred fifty-three thousand, twenty-one".