124072021 has 4 divisors (see below), whose sum is σ = 125351212. Its totient is φ = 122792832.

The previous prime is 124071973. The next prime is 124072031. The reversal of 124072021 is 120270421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120270421 = 31 ⋅3879691.

It can be written as a sum of positive squares in 2 ways, for example, as 22667121 + 101404900 = 4761^2 + 10070^2 .

It is a cyclic number.

It is not a de Polignac number, because 124072021 - 2¹¹ = 124069973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 124072021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124072031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639450 + ... + 639643.

It is an arithmetic number, because the mean of its divisors is an integer number (31337803).

Almost surely, 2^124072021 is an apocalyptic number.

It is an amenable number.

124072021 is a deficient number, since it is larger than the sum of its proper divisors (1279191).

124072021 is an equidigital number, since it uses as much as digits as its factorization.

124072021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279190.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 124072021 is about 11138.7620945956. The cubic root of 124072021 is about 498.7596201267.

The spelling of 124072021 in words is "one hundred twenty-four million, seventy-two thousand, twenty-one".