22311231221 has 8 divisors (see below), whose sum is σ = 22684834200. Its totient is φ = 21940558848.

The previous prime is 22311231191. The next prime is 22311231223. The reversal of 22311231221 is 12213211322.

It can be written as a sum of positive squares in 4 ways, for example, as 961930225 + 21349300996 = 31015^2 + 146114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22311231221 - 2⁶ = 22311231157 is a prime.

It is a super-3 number, since 3×22311231221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22311231193 and 22311231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22311231223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717296 + ... + 747753.

It is an arithmetic number, because the mean of its divisors is an integer number (2835604275).

Almost surely, 2^22311231221 is an apocalyptic number.

It is an amenable number.

22311231221 is a deficient number, since it is larger than the sum of its proper divisors (373602979).

22311231221 is a wasteful number, since it uses less digits than its factorization.

22311231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465303.

The product of its digits is 288, while the sum is 20.

Adding to 22311231221 its reverse (12213211322), we get a palindrome (34524442543).

The spelling of 22311231221 in words is "twenty-two billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".