21210011222 has 16 divisors (see below), whose sum is σ = 32341492512. Its totient is φ = 10429566720.

The previous prime is 21210011153. The next prime is 21210011279. The reversal of 21210011222 is 22211001212.

It is a junction number, because it is equal to n+sod(n) for n = 21210011197 and 21210011206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488998 + ... + 1503174.

It is an arithmetic number, because the mean of its divisors is an integer number (2021343282).

Almost surely, 2^21210011222 is an apocalyptic number.

21210011222 is a deficient number, since it is larger than the sum of its proper divisors (11131481290).

21210011222 is a wasteful number, since it uses less digits than its factorization.

21210011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26503.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210011222 its reverse (22211001212), we get a palindrome (43421012434).

It can be divided in two parts, 212100 and 11222, that added together give a palindrome (223322).

The spelling of 21210011222 in words is "twenty-one billion, two hundred ten million, eleven thousand, two hundred twenty-two".