21010222 has 16 divisors (see below), whose sum is σ = 32519232. Its totient is φ = 10175200.

The previous prime is 21010217. The next prime is 21010229. The reversal of 21010222 is 22201012.

It is a junction number, because it is equal to n+sod(n) for n = 21010199 and 21010208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010229) 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, 8388 + ... + 10600.

It is an arithmetic number, because the mean of its divisors is an integer number (2032452).

Almost surely, 2^21010222 is an apocalyptic number.

21010222 is a deficient number, since it is larger than the sum of its proper divisors (11509010).

21010222 is a wasteful number, since it uses less digits than its factorization.

21010222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21010222 is about 4583.6908709031. The cubic root of 21010222 is about 275.9371750164.

Adding to 21010222 its reverse (22201012), we get a palindrome (43211234).

The spelling of 21010222 in words is "twenty-one million, ten thousand, two hundred twenty-two".