22421228 has 12 divisors (see below), whose sum is σ = 40943280. Its totient is φ = 10723152.

The previous prime is 22421183. The next prime is 22421233. The reversal of 22421228 is 82212422.

It is a super-2 number, since 2×22421228² = 1005422930055968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121763 + ... + 121946.

It is an arithmetic number, because the mean of its divisors is an integer number (3411940).

Almost surely, 2^22421228 is an apocalyptic number.

It is an amenable number.

22421228 is a deficient number, since it is larger than the sum of its proper divisors (18522052).

22421228 is a wasteful number, since it uses less digits than its factorization.

22421228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243736 (or 243734 counting only the distinct ones).

The product of its digits is 1024, while the sum is 23.

The square root of 22421228 is about 4735.1059122263. The cubic root of 22421228 is about 281.9809688211.

The spelling of 22421228 in words is "twenty-two million, four hundred twenty-one thousand, two hundred twenty-eight".