124421221 has 4 divisors (see below), whose sum is σ = 125704012. Its totient is φ = 123138432.

The previous prime is 124421207. The next prime is 124421239. The reversal of 124421221 is 122124421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122124421 = 151 ⋅808771.

It can be written as a sum of positive squares in 2 ways, for example, as 72437121 + 51984100 = 8511^2 + 7210^2 .

It is a cyclic number.

It is not a de Polignac number, because 124421221 - 2⁵ = 124421189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124421621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641250 + ... + 641443.

It is an arithmetic number, because the mean of its divisors is an integer number (31426003).

Almost surely, 2^124421221 is an apocalyptic number.

It is an amenable number.

124421221 is a deficient number, since it is larger than the sum of its proper divisors (1282791).

124421221 is an equidigital number, since it uses as much as digits as its factorization.

124421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282790.

The product of its digits is 256, while the sum is 19.

The square root of 124421221 is about 11154.4260721922. The cubic root of 124421221 is about 499.2271005351.

Adding to 124421221 its reverse (122124421), we get a palindrome (246545642).

The spelling of 124421221 in words is "one hundred twenty-four million, four hundred twenty-one thousand, two hundred twenty-one".