22221220231 has 4 divisors (see below), whose sum is σ = 25395680272. Its totient is φ = 19046760192.

The previous prime is 22221220213. The next prime is 22221220237. The reversal of 22221220231 is 13202212222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13202212222 = 2 ⋅6601106111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221220231 is a prime.

It is a super-2 number, since 2×22221220231² (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 = 22221220199 and 22221220208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221220237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587230010 + ... + 1587230023.

It is an arithmetic number, because the mean of its divisors is an integer number (6348920068).

Almost surely, 2^22221220231 is an apocalyptic number.

22221220231 is a deficient number, since it is larger than the sum of its proper divisors (3174460041).

22221220231 is an equidigital number, since it uses as much as digits as its factorization.

22221220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174460040.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 22221220231 its reverse (13202212222), we get a palindrome (35423432453).

The spelling of 22221220231 in words is "twenty-two billion, two hundred twenty-one million, two hundred twenty thousand, two hundred thirty-one".