21211210222 has 16 divisors (see below), whose sum is σ = 31913481600. Its totient is φ = 10573423840.

The previous prime is 21211210219. The next prime is 21211210249. The reversal of 21211210222 is 22201211212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21211210196 and 21211210205.

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, 1123779 + ... + 1142497.

It is an arithmetic number, because the mean of its divisors is an integer number (1994592600).

Almost surely, 2^21211210222 is an apocalyptic number.

21211210222 is a deficient number, since it is larger than the sum of its proper divisors (10702271378).

21211210222 is a wasteful number, since it uses less digits than its factorization.

21211210222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20411.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21211210222 its reverse (22201211212), we get a palindrome (43412421434).

The spelling of 21211210222 in words is "twenty-one billion, two hundred eleven million, two hundred ten thousand, two hundred twenty-two".