21011133133 has 4 divisors (see below), whose sum is σ = 21011731168. Its totient is φ = 21010535100.

The previous prime is 21011133079. The next prime is 21011133137. The reversal of 21011133133 is 33133111012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21011133133 - 2⁹ = 21011132621 is a prime.

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 21011133133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011133137) 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, 242793 + ... + 317758.

It is an arithmetic number, because the mean of its divisors is an integer number (5252932792).

Almost surely, 2^21011133133 is an apocalyptic number.

It is an amenable number.

21011133133 is a deficient number, since it is larger than the sum of its proper divisors (598035).

21011133133 is an equidigital number, since it uses as much as digits as its factorization.

21011133133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598034.

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

Adding to 21011133133 its reverse (33133111012), we get a palindrome (54144244145).

The spelling of 21011133133 in words is "twenty-one billion, eleven million, one hundred thirty-three thousand, one hundred thirty-three".