124131221 has 4 divisors (see below), whose sum is σ = 126235200. Its totient is φ = 122027244.

The previous prime is 124131209. The next prime is 124131233. The reversal of 124131221 is 122131421.

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 an interprime number because it is at equal distance from previous prime (124131209) and next prime (124131233).

It is a cyclic number.

It is not a de Polignac number, because 124131221 - 2²² = 119936917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 124131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124131251) 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, 1051901 + ... + 1052018.

It is an arithmetic number, because the mean of its divisors is an integer number (31558800).

Almost surely, 2^124131221 is an apocalyptic number.

It is an amenable number.

124131221 is a deficient number, since it is larger than the sum of its proper divisors (2103979).

124131221 is an equidigital number, since it uses as much as digits as its factorization.

124131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103978.

The product of its digits is 96, while the sum is 17.

The square root of 124131221 is about 11141.4191645409. The cubic root of 124131221 is about 498.8389339381.

Adding to 124131221 its reverse (122131421), we get a palindrome (246262642).

The spelling of 124131221 in words is "one hundred twenty-four million, one hundred thirty-one thousand, two hundred twenty-one".