124642121 has 2 divisors, whose sum is σ = 124642122. Its totient is φ = 124642120.

The previous prime is 124642099. The next prime is 124642139. The reversal of 124642121 is 121246421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 7225 = 11164^2 + 85^2 .

It is an emirp because it is prime and its reverse (121246421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124642121 - 2⁶ = 124642057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (124642151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62321060 + 62321061.

It is an arithmetic number, because the mean of its divisors is an integer number (62321061).

Almost surely, 2^124642121 is an apocalyptic number.

It is an amenable number.

124642121 is a deficient number, since it is larger than the sum of its proper divisors (1).

124642121 is an equidigital number, since it uses as much as digits as its factorization.

124642121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 124642121 is about 11164.3235800473. The cubic root of 124642121 is about 499.5223718881.

Adding to 124642121 its reverse (121246421), we get a palindrome (245888542).

The spelling of 124642121 in words is "one hundred twenty-four million, six hundred forty-two thousand, one hundred twenty-one".