21224358 has 24 divisors (see below), whose sum is σ = 46342296. Its totient is φ = 7020000.

The previous prime is 21224353. The next prime is 21224389. The reversal of 21224358 is 85342212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2143 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (1930929).

Almost surely, 2^21224358 is an apocalyptic number.

21224358 is an abundant number, since it is smaller than the sum of its proper divisors (25117938).

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

21224358 is a wasteful number, since it uses less digits than its factorization.

21224358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9140 (or 9137 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21224358 is about 4606.9901237142. The cubic root of 21224358 is about 276.8714578644.

The spelling of 21224358 in words is "twenty-one million, two hundred twenty-four thousand, three hundred fifty-eight".