21133112011 has 8 divisors (see below), whose sum is σ = 24056665344. Its totient is φ = 18376618920.

The previous prime is 21133111957. The next prime is 21133112023. The reversal of 21133112011 is 11021133112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21133112011 - 2¹⁵ = 21133079243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133112051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41764791 + ... + 41765296.

It is an arithmetic number, because the mean of its divisors is an integer number (3007083168).

Almost surely, 2^21133112011 is an apocalyptic number.

21133112011 is a deficient number, since it is larger than the sum of its proper divisors (2923553333).

21133112011 is a wasteful number, since it uses less digits than its factorization.

21133112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83530121.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21133112011 its reverse (11021133112), we get a palindrome (32154245123).

The spelling of 21133112011 in words is "twenty-one billion, one hundred thirty-three million, one hundred twelve thousand, eleven".