22445421 has 16 divisors (see below), whose sum is σ = 30873024. Its totient is φ = 14494464.

The previous prime is 22445419. The next prime is 22445431. The reversal of 22445421 is 12454422.

It is a happy number.

It is not a de Polignac number, because 22445421 - 2¹ = 22445419 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22445391 and 22445400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22445431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47830 + ... + 48296.

It is an arithmetic number, because the mean of its divisors is an integer number (1929564).

Almost surely, 2^22445421 is an apocalyptic number.

It is an amenable number.

22445421 is a deficient number, since it is larger than the sum of its proper divisors (8427603).

22445421 is a wasteful number, since it uses less digits than its factorization.

22445421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its digits is 2560, while the sum is 24.

The square root of 22445421 is about 4737.6598653766. The cubic root of 22445421 is about 282.0823535946.

Adding to 22445421 its reverse (12454422), we get a palindrome (34899843).

Subtracting from 22445421 its reverse (12454422), we obtain a palindrome (9990999).

The spelling of 22445421 in words is "twenty-two million, four hundred forty-five thousand, four hundred twenty-one".