124027721 has 4 divisors (see below), whose sum is σ = 125165700. Its totient is φ = 122889744.

The previous prime is 124027691. The next prime is 124027723. The reversal of 124027721 is 127720421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92544400 + 31483321 = 9620^2 + 5611^2 .

It is a cyclic number.

It is not a de Polignac number, because 124027721 - 2²⁶ = 56918857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124027723) 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, 568826 + ... + 569043.

It is an arithmetic number, because the mean of its divisors is an integer number (31291425).

Almost surely, 2^124027721 is an apocalyptic number.

It is an amenable number.

124027721 is a deficient number, since it is larger than the sum of its proper divisors (1137979).

124027721 is a wasteful number, since it uses less digits than its factorization.

124027721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137978.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 124027721 is about 11136.7733657465. The cubic root of 124027721 is about 498.7002522391.

The spelling of 124027721 in words is "one hundred twenty-four million, twenty-seven thousand, seven hundred twenty-one".