124221713721 has 16 divisors (see below), whose sum is σ = 189319600128. Its totient is φ = 70972822800.

The previous prime is 124221713717. The next prime is 124221713723. The reversal of 124221713721 is 127317122421.

It is not a de Polignac number, because 124221713721 - 2² = 124221713717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (124221713723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319345 + ... + 591966.

It is an arithmetic number, because the mean of its divisors is an integer number (11832475008).

Almost surely, 2^124221713721 is an apocalyptic number.

It is an amenable number.

124221713721 is a deficient number, since it is larger than the sum of its proper divisors (65097886407).

124221713721 is an equidigital number, since it uses as much as digits as its factorization.

124221713721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917812.

The product of its digits is 9408, while the sum is 33.

The spelling of 124221713721 in words is "one hundred twenty-four billion, two hundred twenty-one million, seven hundred thirteen thousand, seven hundred twenty-one".