21936222 has 192 divisors, whose sum is σ = 67392000. Its totient is φ = 5080320.

The previous prime is 21936217. The next prime is 21936247. The reversal of 21936222 is 22263912.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1154529 + ... + 1154547.

It is an arithmetic number, because the mean of its divisors is an integer number (351000).

Almost surely, 2^21936222 is an apocalyptic number.

21936222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21936222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33696000).

21936222 is an abundant number, since it is smaller than the sum of its proper divisors (45455778).

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

21936222 is a wasteful number, since it uses less digits than its factorization.

21936222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 59 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21936222 is about 4683.6120676247. The cubic root of 21936222 is about 279.9329005882.

The spelling of 21936222 in words is "twenty-one million, nine hundred thirty-six thousand, two hundred twenty-two".