21493222 has 4 divisors (see below), whose sum is σ = 32239836. Its totient is φ = 10746610.

The previous prime is 21493217. The next prime is 21493229. The reversal of 21493222 is 22239412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21493229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5373304 + ... + 5373307.

It is an arithmetic number, because the mean of its divisors is an integer number (8059959).

Almost surely, 2^21493222 is an apocalyptic number.

21493222 is a deficient number, since it is larger than the sum of its proper divisors (10746614).

21493222 is a wasteful number, since it uses less digits than its factorization.

21493222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10746613.

The product of its digits is 1728, while the sum is 25.

The square root of 21493222 is about 4636.0782995976. The cubic root of 21493222 is about 278.0356647306.

The spelling of 21493222 in words is "twenty-one million, four hundred ninety-three thousand, two hundred twenty-two".