124971721 has 16 divisors (see below), whose sum is σ = 153187200. Its totient is φ = 99560448.

The previous prime is 124971619. The next prime is 124971761. The reversal of 124971721 is 127179421.

It is a cyclic number.

It is not a de Polignac number, because 124971721 - 2⁷ = 124971593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124971761) 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, 1816 + ... + 15913.

It is an arithmetic number, because the mean of its divisors is an integer number (9574200).

Almost surely, 2^124971721 is an apocalyptic number.

It is an amenable number.

124971721 is a deficient number, since it is larger than the sum of its proper divisors (28215479).

124971721 is a wasteful number, since it uses less digits than its factorization.

124971721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17808.

The product of its digits is 7056, while the sum is 34.

The square root of 124971721 is about 11179.0751406366. The cubic root of 124971721 is about 499.9622918229.

The spelling of 124971721 in words is "one hundred twenty-four million, nine hundred seventy-one thousand, seven hundred twenty-one".