124420421 has 4 divisors (see below), whose sum is σ = 127067712. Its totient is φ = 121773132.

The previous prime is 124420393. The next prime is 124420427. The reversal of 124420421 is 124024421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124024421 = 10909 ⋅11369.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124420421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 124420393 and 124420402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124420427) 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, 1323575 + ... + 1323668.

It is an arithmetic number, because the mean of its divisors is an integer number (31766928).

Almost surely, 2^124420421 is an apocalyptic number.

It is an amenable number.

124420421 is a deficient number, since it is larger than the sum of its proper divisors (2647291).

124420421 is an equidigital number, since it uses as much as digits as its factorization.

124420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647290.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 124420421 is about 11154.3902119300. The cubic root of 124420421 is about 499.2260305608.

Adding to 124420421 its reverse (124024421), we get a palindrome (248444842).

The spelling of 124420421 in words is "one hundred twenty-four million, four hundred twenty thousand, four hundred twenty-one".