22042424521 has 4 divisors (see below), whose sum is σ = 23737995652. Its totient is φ = 20346853392.

The previous prime is 22042424513. The next prime is 22042424549. The reversal of 22042424521 is 12542424022.

It is a happy number.

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 11569153600 + 10473270921 = 107560^2 + 102339^2 .

It is a cyclic number.

It is not a de Polignac number, because 22042424521 - 2³ = 22042424513 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 22042424521.

It is not an unprimeable number, because it can be changed into a prime (22042424501) 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, 847785546 + ... + 847785571.

It is an arithmetic number, because the mean of its divisors is an integer number (5934498913).

Almost surely, 2^22042424521 is an apocalyptic number.

It is an amenable number.

22042424521 is a deficient number, since it is larger than the sum of its proper divisors (1695571131).

22042424521 is a wasteful number, since it uses less digits than its factorization.

22042424521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695571130.

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 22042424521 its reverse (12542424022), we get a palindrome (34584848543).

The spelling of 22042424521 in words is "twenty-two billion, forty-two million, four hundred twenty-four thousand, five hundred twenty-one".