23311320221 has 6 divisors (see below), whose sum is σ = 27117250110. Its totient is φ = 19981131576.

The previous prime is 23311320211. The next prime is 23311320223. The reversal of 23311320221 is 12202311332.

It can be written as a sum of positive squares in only one way, i.e., 20848183321 + 2463136900 = 144389^2 + 49630^2 .

It is not a de Polignac number, because 23311320221 - 2¹⁴ = 23311303837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23311320193 and 23311320202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311320223) 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 5 ways as a sum of consecutive naturals, for example, 237870566 + ... + 237870663.

It is an arithmetic number, because the mean of its divisors is an integer number (4519541685).

Almost surely, 2^23311320221 is an apocalyptic number.

It is an amenable number.

23311320221 is a deficient number, since it is larger than the sum of its proper divisors (3805929889).

23311320221 is an equidigital number, since it uses as much as digits as its factorization.

23311320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475741243 (or 475741236 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23311320221 its reverse (12202311332), we get a palindrome (35513631553).

The spelling of 23311320221 in words is "twenty-three billion, three hundred eleven million, three hundred twenty thousand, two hundred twenty-one".