21212211002111 has 16 divisors (see below), whose sum is σ = 21721491836928. Its totient is φ = 20708809161600.

The previous prime is 21212211002093. The next prime is 21212211002117. The reversal of 21212211002111 is 11120011221212.

It is a cyclic number.

It is not a de Polignac number, because 21212211002111 - 2¹⁴ = 21212210985727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212211002111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212211002117) 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, 101114450 + ... + 101324016.

It is an arithmetic number, because the mean of its divisors is an integer number (1357593239808).

Almost surely, 2^{21212211002111} is an apocalyptic number.

21212211002111 is a deficient number, since it is larger than the sum of its proper divisors (509280834817).

21212211002111 is a wasteful number, since it uses less digits than its factorization.

21212211002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223582.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21212211002111 its reverse (11120011221212), we get a palindrome (32332222223323).

The spelling of 21212211002111 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, two thousand, one hundred eleven".