21210022222111 has 16 divisors (see below), whose sum is σ = 21547592478720. Its totient is φ = 20875227085440.

The previous prime is 21210022222091. The next prime is 21210022222141. The reversal of 21210022222111 is 11122222001212.

It is a cyclic number.

It is not a de Polignac number, because 21210022222111 - 2⁵ = 21210022222079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210022222141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48679255 + ... + 49113031.

It is an arithmetic number, because the mean of its divisors is an integer number (1346724529920).

Almost surely, 2^{21210022222111} is an apocalyptic number.

21210022222111 is a deficient number, since it is larger than the sum of its proper divisors (337570256609).

21210022222111 is a wasteful number, since it uses less digits than its factorization.

21210022222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436974.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21210022222111 its reverse (11122222001212), we get a palindrome (32332244223323).

The spelling of 21210022222111 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, two hundred twenty-two thousand, one hundred eleven".