21133031011 has 4 divisors (see below), whose sum is σ = 21262681672. Its totient is φ = 21003380352.

The previous prime is 21133030999. The next prime is 21133031057. The reversal of 21133031011 is 11013033112.

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 21133031011 - 2¹³ = 21133022819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133031611) 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, 64825086 + ... + 64825411.

It is an arithmetic number, because the mean of its divisors is an integer number (5315670418).

Almost surely, 2^21133031011 is an apocalyptic number.

21133031011 is a deficient number, since it is larger than the sum of its proper divisors (129650661).

21133031011 is a wasteful number, since it uses less digits than its factorization.

21133031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129650660.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21133031011 its reverse (11013033112), we get a palindrome (32146064123).

The spelling of 21133031011 in words is "twenty-one billion, one hundred thirty-three million, thirty-one thousand, eleven".