124037091721 has 9 divisors (see below), whose sum is σ = 131768945749. Its totient is φ = 116735157184.

The previous prime is 124037091707. The next prime is 124037091743. The reversal of 124037091721 is 127190730421.

The square root of 124037091721 is 352189.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 13985664121 + 110051427600 = 118261^2 + 331740^2 .

It is not a de Polignac number, because 124037091721 - 2¹³ = 124037083529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124037091701) 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 8 ways as a sum of consecutive naturals, for example, 5976855 + ... + 5997571.

Almost surely, 2^124037091721 is an apocalyptic number.

124037091721 is the 352189-th square number.

124037091721 is the 176095-th centered octagonal number.

It is an amenable number.

124037091721 is a deficient number, since it is larger than the sum of its proper divisors (7731854028).

124037091721 is an frugal number, since it uses more digits than its factorization.

124037091721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41468 (or 20734 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 124037091721 in words is "one hundred twenty-four billion, thirty-seven million, ninety-one thousand, seven hundred twenty-one".