124115251021 has 2 divisors, whose sum is σ = 124115251022. Its totient is φ = 124115251020.

The previous prime is 124115250997. The next prime is 124115251063. The reversal of 124115251021 is 120152511421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117261729225 + 6853521796 = 342435^2 + 82786^2 .

It is a cyclic number.

It is not a de Polignac number, because 124115251021 - 2¹¹ = 124115248973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124115231021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62057625510 + 62057625511.

It is an arithmetic number, because the mean of its divisors is an integer number (62057625511).

Almost surely, 2^124115251021 is an apocalyptic number.

It is an amenable number.

124115251021 is a deficient number, since it is larger than the sum of its proper divisors (1).

124115251021 is an equidigital number, since it uses as much as digits as its factorization.

124115251021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 124115251021 its reverse (120152511421), we get a palindrome (244267762442).

The spelling of 124115251021 in words is "one hundred twenty-four billion, one hundred fifteen million, two hundred fifty-one thousand, twenty-one".