21222848 has 56 divisors (see below), whose sum is σ = 45841920. Its totient is φ = 9711360.

The previous prime is 21222847. The next prime is 21222913. The reversal of 21222848 is 84822212.

It is a super-2 number, since 2×21222848² = 900818554462208, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21222848.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37415 + ... + 37977.

Almost surely, 2^21222848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22920960).

21222848 is an abundant number, since it is smaller than the sum of its proper divisors (24619072).

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

21222848 is a wasteful number, since it uses less digits than its factorization.

21222848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 615 counting only the distinct ones).

The product of its digits is 4096, while the sum is 29.

The square root of 21222848 is about 4606.8262393974. The cubic root of 21222848 is about 276.8648917323.

The spelling of 21222848 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred forty-eight".