124205621 has 4 divisors (see below), whose sum is σ = 131511852. Its totient is φ = 116899392.

The previous prime is 124205611. The next prime is 124205657. The reversal of 124205621 is 126502421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116856100 + 7349521 = 10810^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 124205621 - 2¹⁴ = 124189237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124205611) 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, 3653090 + ... + 3653123.

It is an arithmetic number, because the mean of its divisors is an integer number (32877963).

Almost surely, 2^124205621 is an apocalyptic number.

It is an amenable number.

124205621 is a deficient number, since it is larger than the sum of its proper divisors (7306231).

124205621 is an equidigital number, since it uses as much as digits as its factorization.

124205621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7306230.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 124205621 is about 11144.7575568067. The cubic root of 124205621 is about 498.9385763541.

The spelling of 124205621 in words is "one hundred twenty-four million, two hundred five thousand, six hundred twenty-one".