124130021 has 4 divisors (see below), whose sum is σ = 130663200. Its totient is φ = 117596844.

The previous prime is 124129997. The next prime is 124130033. The reversal of 124130021 is 120031421.

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 a cyclic number.

It is not a de Polignac number, because 124130021 - 2¹⁴ = 124113637 is a prime.

It is a super-2 number, since 2×124130021² = 30816524226920882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 124129978 and 124130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124130521) 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, 3266561 + ... + 3266598.

It is an arithmetic number, because the mean of its divisors is an integer number (32665800).

Almost surely, 2^124130021 is an apocalyptic number.

It is an amenable number.

124130021 is a deficient number, since it is larger than the sum of its proper divisors (6533179).

124130021 is an equidigital number, since it uses as much as digits as its factorization.

124130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533178.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 124130021 is about 11141.3653113072. The cubic root of 124130021 is about 498.8373264762.

Adding to 124130021 its reverse (120031421), we get a palindrome (244161442).

The spelling of 124130021 in words is "one hundred twenty-four million, one hundred thirty thousand, twenty-one".