124252121989 has 2 divisors, whose sum is σ = 124252121990. Its totient is φ = 124252121988.

The previous prime is 124252121953. The next prime is 124252122017. The reversal of 124252121989 is 989121252421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103848285025 + 20403836964 = 322255^2 + 142842^2 .

It is an emirp because it is prime and its reverse (989121252421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124252121989 - 2²¹ = 124250024837 is a prime.

It is a super-2 number, since 2×124252121989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124252121089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62126060994 + 62126060995.

It is an arithmetic number, because the mean of its divisors is an integer number (62126060995).

Almost surely, 2^124252121989 is an apocalyptic number.

It is an amenable number.

124252121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

124252121989 is an equidigital number, since it uses as much as digits as its factorization.

124252121989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The spelling of 124252121989 in words is "one hundred twenty-four billion, two hundred fifty-two million, one hundred twenty-one thousand, nine hundred eighty-nine".