21224658 has 32 divisors (see below), whose sum is σ = 52246656. Its totient is φ = 5597568.

The previous prime is 21224657. The next prime is 21224659. The reversal of 21224658 is 85642212.

It is an interprime number because it is at equal distance from previous prime (21224657) and next prime (21224659).

It is a super-2 number, since 2×21224658² = 900972214433928, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21224657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18891 + ... + 19982.

It is an arithmetic number, because the mean of its divisors is an integer number (1632708).

Almost surely, 2^21224658 is an apocalyptic number.

21224658 is an abundant number, since it is smaller than the sum of its proper divisors (31021998).

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

21224658 is a wasteful number, since it uses less digits than its factorization.

21224658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38898.

The product of its digits is 7680, while the sum is 30.

The square root of 21224658 is about 4607.0226828180. The cubic root of 21224658 is about 276.8727623569.

The spelling of 21224658 in words is "twenty-one million, two hundred twenty-four thousand, six hundred fifty-eight".