22045421 has 4 divisors (see below), whose sum is σ = 22057632. Its totient is φ = 22033212.

The previous prime is 22045367. The next prime is 22045427. The reversal of 22045421 is 12454022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22045421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22045393 and 22045402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22045427) 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, 2801 + ... + 7206.

It is an arithmetic number, because the mean of its divisors is an integer number (5514408).

Almost surely, 2^22045421 is an apocalyptic number.

It is an amenable number.

22045421 is a deficient number, since it is larger than the sum of its proper divisors (12211).

22045421 is a wasteful number, since it uses less digits than its factorization.

22045421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12210.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 22045421 is about 4695.2551581357. The cubic root of 22045421 is about 280.3966360064.

Adding to 22045421 its reverse (12454022), we get a palindrome (34499443).

The spelling of 22045421 in words is "twenty-two million, forty-five thousand, four hundred twenty-one".