21133012211 has 16 divisors (see below), whose sum is σ = 21946140000. Its totient is φ = 20325693696.

The previous prime is 21133012207. The next prime is 21133012247. The reversal of 21133012211 is 11221033112.

It is a cyclic number.

It is not a de Polignac number, because 21133012211 - 2² = 21133012207 is a prime.

It is a super-2 number, since 2×21133012211² (a number of 21 digits) contains 22 as substring.

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 21133012211.

It is not an unprimeable number, because it can be changed into a prime (21133012711) 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, 10213085 + ... + 10215153.

It is an arithmetic number, because the mean of its divisors is an integer number (1371633750).

Almost surely, 2^21133012211 is an apocalyptic number.

21133012211 is a deficient number, since it is larger than the sum of its proper divisors (813127789).

21133012211 is a wasteful number, since it uses less digits than its factorization.

21133012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21133012211 its reverse (11221033112), we get a palindrome (32354045323).

The spelling of 21133012211 in words is "twenty-one billion, one hundred thirty-three million, twelve thousand, two hundred eleven".