124512121 has 4 divisors (see below), whose sum is σ = 127549044. Its totient is φ = 121475200.

The previous prime is 124512107. The next prime is 124512127. The reversal of 124512121 is 121215421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10791225 + 113720896 = 3285^2 + 10664^2 .

It is a cyclic number.

It is not a de Polignac number, because 124512121 - 2²¹ = 122414969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124512127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518400 + ... + 1518481.

It is an arithmetic number, because the mean of its divisors is an integer number (31887261).

Almost surely, 2^124512121 is an apocalyptic number.

It is an amenable number.

124512121 is a deficient number, since it is larger than the sum of its proper divisors (3036923).

124512121 is an equidigital number, since it uses as much as digits as its factorization.

124512121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036922.

The product of its digits is 160, while the sum is 19.

The square root of 124512121 is about 11158.4999439889. The cubic root of 124512121 is about 499.3486465124.

Adding to 124512121 its reverse (121215421), we get a palindrome (245727542).

It can be divided in two parts, 1245 and 12121, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 124512121 in words is "one hundred twenty-four million, five hundred twelve thousand, one hundred twenty-one".