22231223221 has 16 divisors (see below), whose sum is σ = 23830876080. Its totient is φ = 20665036800.

The previous prime is 22231223219. The next prime is 22231223233. The reversal of 22231223221 is 12232213222.

It can be written as a sum of positive squares in 8 ways, for example, as 8768262321 + 13462960900 = 93639^2 + 116030^2 .

It is not a de Polignac number, because 22231223221 - 2¹ = 22231223219 is a prime.

It is a super-2 number, since 2×22231223221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22231223192 and 22231223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22231223281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 686425 + ... + 718081.

It is an arithmetic number, because the mean of its divisors is an integer number (1489429755).

Almost surely, 2^22231223221 is an apocalyptic number.

It is an amenable number.

22231223221 is a deficient number, since it is larger than the sum of its proper divisors (1599652859).

22231223221 is a wasteful number, since it uses less digits than its factorization.

22231223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32184.

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

Adding to 22231223221 its reverse (12232213222), we get a palindrome (34463436443).

Subtracting from 22231223221 its reverse (12232213222), we obtain a palindrome (9999009999).

The spelling of 22231223221 in words is "twenty-two billion, two hundred thirty-one million, two hundred twenty-three thousand, two hundred twenty-one".