21022123210 has 32 divisors (see below), whose sum is σ = 41299637184. Its totient is φ = 7640736000.

The previous prime is 21022123193. The next prime is 21022123223. The reversal of 21022123210 is 1232122012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189570 + ... + 279250.

It is an arithmetic number, because the mean of its divisors is an integer number (1290613662).

Almost surely, 2^21022123210 is an apocalyptic number.

21022123210 is a deficient number, since it is larger than the sum of its proper divisors (20277513974).

21022123210 is a wasteful number, since it uses less digits than its factorization.

21022123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91830.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21022123210 its reverse (1232122012), we get a palindrome (22254245222).

The spelling of 21022123210 in words is "twenty-one billion, twenty-two million, one hundred twenty-three thousand, two hundred ten".