124242121 has 6 divisors (see below), whose sum is σ = 131125722. Its totient is φ = 117702720.

The previous prime is 124242109. The next prime is 124242133. The reversal of 124242121 is 121242421.

It is an interprime number because it is at equal distance from previous prime (124242109) and next prime (124242133).

It can be written as a sum of positive squares in only one way, i.e., 123543225 + 698896 = 11115^2 + 836^2 .

It is not a de Polignac number, because 124242121 - 2⁵ = 124242089 is a prime.

It is a super-2 number, since 2×124242121² = 30872209261157282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124242101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171720 + ... + 172441.

It is an arithmetic number, because the mean of its divisors is an integer number (21854287).

Almost surely, 2^124242121 is an apocalyptic number.

It is an amenable number.

124242121 is a deficient number, since it is larger than the sum of its proper divisors (6883601).

124242121 is an equidigital number, since it uses as much as digits as its factorization.

124242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344199 (or 344180 counting only the distinct ones).

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

The square root of 124242121 is about 11146.3949777495. The cubic root of 124242121 is about 498.9874455177.

Adding to 124242121 its reverse (121242421), we get a palindrome (245484542).

The spelling of 124242121 in words is "one hundred twenty-four million, two hundred forty-two thousand, one hundred twenty-one".