21253226 has 8 divisors (see below), whose sum is σ = 32189664. Its totient is φ = 10523340.

The previous prime is 21253217. The next prime is 21253237. The reversal of 21253226 is 62235212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51380 + ... + 51791.

It is an arithmetic number, because the mean of its divisors is an integer number (4023708).

Almost surely, 2^21253226 is an apocalyptic number.

21253226 is a deficient number, since it is larger than the sum of its proper divisors (10936438).

21253226 is a wasteful number, since it uses less digits than its factorization.

21253226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103276.

The product of its digits is 1440, while the sum is 23.

The square root of 21253226 is about 4610.1221241958. The cubic root of 21253226 is about 276.9969285501.

Adding to 21253226 its reverse (62235212), we get a palindrome (83488438).

The spelling of 21253226 in words is "twenty-one million, two hundred fifty-three thousand, two hundred twenty-six".