21211203133 has 4 divisors (see below), whose sum is σ = 21417137248. Its totient is φ = 21005269020.

The previous prime is 21211203121. The next prime is 21211203199. The reversal of 21211203133 is 33130211212.

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 a de Polignac number, because none of the positive numbers 2^k-21211203133 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 21211203133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211209133) 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, 102966903 + ... + 102967108.

It is an arithmetic number, because the mean of its divisors is an integer number (5354284312).

Almost surely, 2^21211203133 is an apocalyptic number.

It is an amenable number.

21211203133 is a deficient number, since it is larger than the sum of its proper divisors (205934115).

21211203133 is a wasteful number, since it uses less digits than its factorization.

21211203133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205934114.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21211203133 its reverse (33130211212), we get a palindrome (54341414345).

The spelling of 21211203133 in words is "twenty-one billion, two hundred eleven million, two hundred three thousand, one hundred thirty-three".