21223122231 has 4 divisors (see below), whose sum is σ = 28297496312. Its totient is φ = 14148748152.

The previous prime is 21223122209. The next prime is 21223122241. The reversal of 21223122231 is 13222132212.

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

It is not a de Polignac number, because 21223122231 - 2¹⁰ = 21223121207 is a prime.

It is a super-2 number, since 2×21223122231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223122198 and 21223122207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223122241) 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, 3537187036 + ... + 3537187041.

It is an arithmetic number, because the mean of its divisors is an integer number (7074374078).

Almost surely, 2^21223122231 is an apocalyptic number.

21223122231 is a deficient number, since it is larger than the sum of its proper divisors (7074374081).

21223122231 is an equidigital number, since it uses as much as digits as its factorization.

21223122231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074374080.

The product of its digits is 576, while the sum is 21.

Adding to 21223122231 its reverse (13222132212), we get a palindrome (34445254443).

The spelling of 21223122231 in words is "twenty-one billion, two hundred twenty-three million, one hundred twenty-two thousand, two hundred thirty-one".