21224088 has 96 divisors (see below), whose sum is σ = 61176960. Its totient is φ = 6635520.

The previous prime is 21224087. The next prime is 21224123. The reversal of 21224088 is 88042212.

It is a super-2 number, since 2×21224088² = 900923822863488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82456 + ... + 82712.

It is an arithmetic number, because the mean of its divisors is an integer number (637260).

Almost surely, 2^21224088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30588480).

21224088 is an abundant number, since it is smaller than the sum of its proper divisors (39952872).

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

21224088 is a wasteful number, since it uses less digits than its factorization.

21224088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 21224088 is about 4606.9608203240. The cubic root of 21224088 is about 276.8702838107.

The spelling of 21224088 in words is "twenty-one million, two hundred twenty-four thousand, eighty-eight".