21222131233 has 4 divisors (see below), whose sum is σ = 21222822448. Its totient is φ = 21221440020.

The previous prime is 21222131219. The next prime is 21222131321. The reversal of 21222131233 is 33213122212.

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 21222131233 - 2³³ = 12632196641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222131213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297303 + ... + 361708.

It is an arithmetic number, because the mean of its divisors is an integer number (5305705612).

Almost surely, 2^21222131233 is an apocalyptic number.

It is an amenable number.

21222131233 is a deficient number, since it is larger than the sum of its proper divisors (691215).

21222131233 is an equidigital number, since it uses as much as digits as its factorization.

21222131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691214.

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

Adding to 21222131233 its reverse (33213122212), we get a palindrome (54435253445).

The spelling of 21222131233 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, two hundred thirty-three".