21322222231 has 4 divisors (see below), whose sum is σ = 21330172072. Its totient is φ = 21314272392.

The previous prime is 21322222217. The next prime is 21322222267. The reversal of 21322222231 is 13222222312.

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 21322222231 - 2²⁷ = 21188004503 is a prime.

It is a super-2 number, since 2×21322222231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322222291) 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, 3970896 + ... + 3976261.

It is an arithmetic number, because the mean of its divisors is an integer number (5332543018).

Almost surely, 2^21322222231 is an apocalyptic number.

21322222231 is a deficient number, since it is larger than the sum of its proper divisors (7949841).

21322222231 is an equidigital number, since it uses as much as digits as its factorization.

21322222231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7949840.

The product of its digits is 1152, while the sum is 22.

Adding to 21322222231 its reverse (13222222312), we get a palindrome (34544444543).

It can be divided in two parts, 2 and 1322222231, that multiplied together give a palindrome (2644444462).

The spelling of 21322222231 in words is "twenty-one billion, three hundred twenty-two million, two hundred twenty-two thousand, two hundred thirty-one".