21182224 has 20 divisors (see below), whose sum is σ = 46903744. Its totient is φ = 9078048.

The previous prime is 21182201. The next prime is 21182243. The reversal of 21182224 is 42228112.

It is a super-2 number, since 2×21182224² = 897373227172352, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21182195 and 21182204.

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, 94452 + ... + 94675.

Almost surely, 2^21182224 is an apocalyptic number.

It is an amenable number.

21182224 is an abundant number, since it is smaller than the sum of its proper divisors (25721520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21182224 is a wasteful number, since it uses less digits than its factorization.

21182224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189142 (or 189136 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 21182224 is about 4602.4150182268. The cubic root of 21182224 is about 276.6881240112.

The spelling of 21182224 in words is "twenty-one million, one hundred eighty-two thousand, two hundred twenty-four".