21696222 has 16 divisors (see below), whose sum is σ = 45279360. Its totient is φ = 6917592.

The previous prime is 21696217. The next prime is 21696277. The reversal of 21696222 is 22269612.

It is a self number, because there is not a number n which added to its sum of digits gives 21696222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78472 + ... + 78747.

It is an arithmetic number, because the mean of its divisors is an integer number (2829960).

Almost surely, 2^21696222 is an apocalyptic number.

21696222 is an abundant number, since it is smaller than the sum of its proper divisors (23583138).

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

21696222 is a wasteful number, since it uses less digits than its factorization.

21696222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157247.

The product of its digits is 5184, while the sum is 30.

The square root of 21696222 is about 4657.9203514015. The cubic root of 21696222 is about 278.9082572422.

The spelling of 21696222 in words is "twenty-one million, six hundred ninety-six thousand, two hundred twenty-two".