21224082 has 16 divisors (see below), whose sum is σ = 46307232. Its totient is φ = 6431520.

The previous prime is 21224081. The next prime is 21224087. The reversal of 21224082 is 28042212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21224081) 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, 160723 + ... + 160854.

It is an arithmetic number, because the mean of its divisors is an integer number (2894202).

Almost surely, 2^21224082 is an apocalyptic number.

21224082 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21224082 is an abundant number, since it is smaller than the sum of its proper divisors (25083150).

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

21224082 is a wasteful number, since it uses less digits than its factorization.

21224082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321593.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 21224082 is about 4606.9601691354. The cubic root of 21224082 is about 276.8702577205.

Adding to 21224082 its reverse (28042212), we get a palindrome (49266294).

The spelling of 21224082 in words is "twenty-one million, two hundred twenty-four thousand, eighty-two".