21111102221211 has 12 divisors (see below), whose sum is σ = 31317971463792. Its totient is φ = 13693687927056.

The previous prime is 21111102221197. The next prime is 21111102221257. The reversal of 21111102221211 is 11212220111112.

It is a happy number.

21111102221211 is a `hidden beast` number, since 21 + 111 + 102 + 221 + 211 = 666.

It is not a de Polignac number, because 21111102221211 - 2⁵ = 21111102221179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111102221311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31698351351 + ... + 31698352016.

It is an arithmetic number, because the mean of its divisors is an integer number (2609830955316).

Almost surely, 2^{21111102221211} is an apocalyptic number.

21111102221211 is a deficient number, since it is larger than the sum of its proper divisors (10206869242581).

21111102221211 is a wasteful number, since it uses less digits than its factorization.

21111102221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63396703410 (or 63396703407 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21111102221211 its reverse (11212220111112), we get a palindrome (32323322332323).

The spelling of 21111102221211 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, two hundred twenty-one thousand, two hundred eleven".