21002223133 has 4 divisors (see below), whose sum is σ = 21398491548. Its totient is φ = 20605954720.

The previous prime is 21002223101. The next prime is 21002223149. The reversal of 21002223133 is 33132220012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14490862884 + 6511360249 = 120378^2 + 80693^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002223133 - 2⁵ = 21002223101 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 21002223133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002223433) 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, 198134128 + ... + 198134233.

It is an arithmetic number, because the mean of its divisors is an integer number (5349622887).

Almost surely, 2^21002223133 is an apocalyptic number.

It is an amenable number.

21002223133 is a deficient number, since it is larger than the sum of its proper divisors (396268415).

21002223133 is an equidigital number, since it uses as much as digits as its factorization.

21002223133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396268414.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21002223133 its reverse (33132220012), we get a palindrome (54134443145).

The spelling of 21002223133 in words is "twenty-one billion, two million, two hundred twenty-three thousand, one hundred thirty-three".