21211211222110 has 32 divisors (see below), whose sum is σ = 46990991017152. Its totient is φ = 6712998716160.

The previous prime is 21211211222083. The next prime is 21211211222147. The reversal of 21211211222110 is 1122211211212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11654510751 + ... + 11654512570.

It is an arithmetic number, because the mean of its divisors is an integer number (1468468469286).

Almost surely, 2^{21211211222110} is an apocalyptic number.

21211211222110 is an abundant number, since it is smaller than the sum of its proper divisors (25779779795042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211211222110 is a wasteful number, since it uses less digits than its factorization.

21211211222110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23309023348.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211211222110 its reverse (1122211211212), we get a palindrome (22333422433322).

The spelling of 21211211222110 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, one hundred ten".