23213222221 has 6 divisors (see below), whose sum is σ = 27003136110. Its totient is φ = 19897047576.

The previous prime is 23213222143. The next prime is 23213222233. The reversal of 23213222221 is 12222231232.

It can be written as a sum of positive squares in only one way, i.e., 17605309225 + 5607912996 = 132685^2 + 74886^2 .

It is not a de Polignac number, because 23213222221 - 2¹³ = 23213214029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23213222192 and 23213222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213222281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 236869566 + ... + 236869663.

It is an arithmetic number, because the mean of its divisors is an integer number (4500522685).

Almost surely, 2^23213222221 is an apocalyptic number.

It is an amenable number.

23213222221 is a deficient number, since it is larger than the sum of its proper divisors (3789913889).

23213222221 is an equidigital number, since it uses as much as digits as its factorization.

23213222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473739243 (or 473739236 counting only the distinct ones).

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

Adding to 23213222221 its reverse (12222231232), we get a palindrome (35435453453).

The spelling of 23213222221 in words is "twenty-three billion, two hundred thirteen million, two hundred twenty-two thousand, two hundred twenty-one".