21002111133 has 16 divisors (see below), whose sum is σ = 28700581056. Its totient is φ = 13652876160.

The previous prime is 21002111077. The next prime is 21002111159. The reversal of 21002111133 is 33111120012.

It is a happy number.

It is not a de Polignac number, because 21002111133 - 2⁹ = 21002110621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002111173) 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, 201435 + ... + 287367.

It is an arithmetic number, because the mean of its divisors is an integer number (1793786316).

Almost surely, 2^21002111133 is an apocalyptic number.

It is an amenable number.

21002111133 is a deficient number, since it is larger than the sum of its proper divisors (7698469923).

21002111133 is a wasteful number, since it uses less digits than its factorization.

21002111133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87964.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21002111133 its reverse (33111120012), we get a palindrome (54113231145).

The spelling of 21002111133 in words is "twenty-one billion, two million, one hundred eleven thousand, one hundred thirty-three".