21133133011 has 4 divisors (see below), whose sum is σ = 21148662024. Its totient is φ = 21117604000.

The previous prime is 21133132997. The next prime is 21133133017. The reversal of 21133133011 is 11033133112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21133133011 - 2¹⁵ = 21133100243 is a prime.

It is a super-2 number, since 2×21133133011² (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 21133133011.

It is not an unprimeable number, because it can be changed into a prime (21133133017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7762465 + ... + 7765186.

It is an arithmetic number, because the mean of its divisors is an integer number (5287165506).

Almost surely, 2^21133133011 is an apocalyptic number.

21133133011 is a deficient number, since it is larger than the sum of its proper divisors (15529013).

21133133011 is a wasteful number, since it uses less digits than its factorization.

21133133011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15529012.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21133133011 its reverse (11033133112), we get a palindrome (32166266123).

The spelling of 21133133011 in words is "twenty-one billion, one hundred thirty-three million, one hundred thirty-three thousand, eleven".