22124021 has 4 divisors (see below), whose sum is σ = 23425452. Its totient is φ = 20822592.

The previous prime is 22124009. The next prime is 22124023. The reversal of 22124021 is 12042122.

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 9796900 + 12327121 = 3130^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 22124021 - 2⁶ = 22123957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22123987 and 22124005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22124023) 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, 650690 + ... + 650723.

It is an arithmetic number, because the mean of its divisors is an integer number (5856363).

Almost surely, 2^22124021 is an apocalyptic number.

It is an amenable number.

22124021 is a deficient number, since it is larger than the sum of its proper divisors (1301431).

22124021 is a wasteful number, since it uses less digits than its factorization.

22124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301430.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22124021 is about 4703.6178628796. The cubic root of 22124021 is about 280.7294796503.

Adding to 22124021 its reverse (12042122), we get a palindrome (34166143).

It can be divided in two parts, 221 and 24021, that added together give a palindrome (24242).

The spelling of 22124021 in words is "twenty-two million, one hundred twenty-four thousand, twenty-one".