21022330 has 16 divisors (see below), whose sum is σ = 43246080. Its totient is φ = 7207632.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022330 is 3322012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022330.

It is an unprimeable number.

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, 150090 + ... + 150229.

It is an arithmetic number, because the mean of its divisors is an integer number (2702880).

Almost surely, 2^21022330 is an apocalyptic number.

21022330 is an abundant number, since it is smaller than the sum of its proper divisors (22223750).

21022330 is a wasteful number, since it uses less digits than its factorization.

21022330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300333.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21022330 is about 4585.0114503674. The cubic root of 21022330 is about 275.9901715327.

Adding to 21022330 its reverse (3322012), we get a palindrome (24344342).

The spelling of 21022330 in words is "twenty-one million, twenty-two thousand, three hundred thirty".