124320021 has 32 divisors (see below), whose sum is σ = 202828800. Its totient is φ = 66147840.

The previous prime is 124320011. The next prime is 124320067. The reversal of 124320021 is 120023421.

It is not a de Polignac number, because 124320021 - 2⁵ = 124319989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124320011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20901 + ... + 26181.

It is an arithmetic number, because the mean of its divisors is an integer number (6338400).

Almost surely, 2^124320021 is an apocalyptic number.

It is an amenable number.

124320021 is a deficient number, since it is larger than the sum of its proper divisors (78508779).

124320021 is a wasteful number, since it uses less digits than its factorization.

124320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 124320021 is about 11149.8888335265. Note that the first 4 decimals coincide. The cubic root of 124320021 is about 499.0917123596.

Adding to 124320021 its reverse (120023421), we get a palindrome (244343442).

The spelling of 124320021 in words is "one hundred twenty-four million, three hundred twenty thousand, twenty-one".