22421428 has 6 divisors (see below), whose sum is σ = 39237506. Its totient is φ = 11210712.

The previous prime is 22421423. The next prime is 22421429. The reversal of 22421428 is 82412422.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 1737124 = 4548^2 + 1318^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22421423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802675 + ... + 2802682.

Almost surely, 2^22421428 is an apocalyptic number.

It is an amenable number.

22421428 is a deficient number, since it is larger than the sum of its proper divisors (16816078).

22421428 is a wasteful number, since it uses less digits than its factorization.

22421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605361 (or 5605359 counting only the distinct ones).

The product of its digits is 2048, while the sum is 25.

The square root of 22421428 is about 4735.1270310310. The cubic root of 22421428 is about 281.9818072532.

The spelling of 22421428 in words is "twenty-two million, four hundred twenty-one thousand, four hundred twenty-eight".