21102212211211 has 16 divisors (see below), whose sum is σ = 21380942812320. Its totient is φ = 20824074915840.

The previous prime is 21102212211187. The next prime is 21102212211253. The reversal of 21102212211211 is 11211221220112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21102212211211 - 2³³ = 21093622276619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102212211011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365637025 + ... + 365694733.

It is an arithmetic number, because the mean of its divisors is an integer number (1336308925770).

Almost surely, 2^{21102212211211} is an apocalyptic number.

21102212211211 is a deficient number, since it is larger than the sum of its proper divisors (278730601109).

21102212211211 is a wasteful number, since it uses less digits than its factorization.

21102212211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62766.

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

Adding to 21102212211211 its reverse (11211221220112), we get a palindrome (32313433431323).

The spelling of 21102212211211 in words is "twenty-one trillion, one hundred two billion, two hundred twelve million, two hundred eleven thousand, two hundred eleven".