124894257721 has 4 divisors (see below), whose sum is σ = 125176186512. Its totient is φ = 124612328932.

The previous prime is 124894257707. The next prime is 124894257757. The reversal of 124894257721 is 127752498421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 124894257721 - 2⁹ = 124894257209 is a prime.

It is a super-2 number, since 2×124894257721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124894251721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140963731 + ... + 140964616.

It is an arithmetic number, because the mean of its divisors is an integer number (31294046628).

Almost surely, 2^124894257721 is an apocalyptic number.

It is an amenable number.

124894257721 is a deficient number, since it is larger than the sum of its proper divisors (281928791).

124894257721 is an equidigital number, since it uses as much as digits as its factorization.

124894257721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281928790.

The product of its digits is 2257920, while the sum is 52.

The spelling of 124894257721 in words is "one hundred twenty-four billion, eight hundred ninety-four million, two hundred fifty-seven thousand, seven hundred twenty-one".