21256222 has 16 divisors (see below), whose sum is σ = 36357552. Its totient is φ = 9233280.

The previous prime is 21256153. The next prime is 21256229. The reversal of 21256222 is 22265212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21256193 and 21256202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23604 + ... + 24487.

It is an arithmetic number, because the mean of its divisors is an integer number (2272347).

Almost surely, 2^21256222 is an apocalyptic number.

21256222 is a deficient number, since it is larger than the sum of its proper divisors (15101330).

21256222 is a wasteful number, since it uses less digits than its factorization.

21256222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48123.

The product of its digits is 960, while the sum is 22.

The square root of 21256222 is about 4610.4470499074. The cubic root of 21256222 is about 277.0099437320.

The spelling of 21256222 in words is "twenty-one million, two hundred fifty-six thousand, two hundred twenty-two".