21211211333 has 16 divisors (see below), whose sum is σ = 22964524800. Its totient is φ = 19475449920.

The previous prime is 21211211311. The next prime is 21211211339. The reversal of 21211211333 is 33311211212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21211211333 - 2²⁴ = 21194434117 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 (21211211339) 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, 3840548 + ... + 3846066.

It is an arithmetic number, because the mean of its divisors is an integer number (1435282800).

Almost surely, 2^21211211333 is an apocalyptic number.

It is an amenable number.

21211211333 is a deficient number, since it is larger than the sum of its proper divisors (1753313467).

21211211333 is a wasteful number, since it uses less digits than its factorization.

21211211333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7052.

The product of its digits is 216, while the sum is 20.

Adding to 21211211333 its reverse (33311211212), we get a palindrome (54522422545).

The spelling of 21211211333 in words is "twenty-one billion, two hundred eleven million, two hundred eleven thousand, three hundred thirty-three".