21948222 has 16 divisors (see below), whose sum is σ = 44218512. Its totient is φ = 7262400.

The previous prime is 21948221. The next prime is 21948229. The reversal of 21948222 is 22284912.

It is a super-2 number, since 2×21948222² = 963448897922568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21948222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948221) 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, 12529 + ... + 14172.

It is an arithmetic number, because the mean of its divisors is an integer number (2763657).

Almost surely, 2^21948222 is an apocalyptic number.

21948222 is an abundant number, since it is smaller than the sum of its proper divisors (22270290).

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

21948222 is a wasteful number, since it uses less digits than its factorization.

21948222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26843.

The product of its digits is 4608, while the sum is 30.

The square root of 21948222 is about 4684.8929550204. The cubic root of 21948222 is about 279.9839361533.

The spelling of 21948222 in words is "twenty-one million, nine hundred forty-eight thousand, two hundred twenty-two".