21244226 has 32 divisors (see below), whose sum is σ = 34604928. Its totient is φ = 9757440.

The previous prime is 21244219. The next prime is 21244229. The reversal of 21244226 is 62244212.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21244229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187946 + ... + 188058.

It is an arithmetic number, because the mean of its divisors is an integer number (1081404).

Almost surely, 2^21244226 is an apocalyptic number.

21244226 is a deficient number, since it is larger than the sum of its proper divisors (13360702).

21244226 is a wasteful number, since it uses less digits than its factorization.

21244226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its digits is 1536, while the sum is 23.

The square root of 21244226 is about 4609.1459078662. The cubic root of 21244226 is about 276.9578235167.

Adding to 21244226 its reverse (62244212), we get a palindrome (83488438).

The spelling of 21244226 in words is "twenty-one million, two hundred forty-four thousand, two hundred twenty-six".