21133222231 has 4 divisors (see below), whose sum is σ = 23054424264. Its totient is φ = 19212020200.

The previous prime is 21133222211. The next prime is 21133222241. The reversal of 21133222231 is 13222233112.

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 21133222231 - 2⁵ = 21133222199 is a prime.

It is a super-2 number, since 2×21133222231² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960601000 + ... + 960601021.

It is an arithmetic number, because the mean of its divisors is an integer number (5763606066).

Almost surely, 2^21133222231 is an apocalyptic number.

21133222231 is a deficient number, since it is larger than the sum of its proper divisors (1921202033).

21133222231 is a wasteful number, since it uses less digits than its factorization.

21133222231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921202032.

The product of its digits is 864, while the sum is 22.

Adding to 21133222231 its reverse (13222233112), we get a palindrome (34355455343).

The spelling of 21133222231 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-two thousand, two hundred thirty-one".