20221310321 has 4 divisors (see below), whose sum is σ = 20602844532. Its totient is φ = 19839776112.

The previous prime is 20221310311. The next prime is 20221310341. The reversal of 20221310321 is 12301312202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9075229696 + 11146080625 = 95264^2 + 105575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221310321 is a prime.

It is a super-2 number, since 2×20221310321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20221310321.

It is not an unprimeable number, because it can be changed into a prime (20221310311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190767026 + ... + 190767131.

It is an arithmetic number, because the mean of its divisors is an integer number (5150711133).

Almost surely, 2^20221310321 is an apocalyptic number.

It is an amenable number.

20221310321 is a deficient number, since it is larger than the sum of its proper divisors (381534211).

20221310321 is an equidigital number, since it uses as much as digits as its factorization.

20221310321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381534210.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20221310321 its reverse (12301312202), we get a palindrome (32522622523).

The spelling of 20221310321 in words is "twenty billion, two hundred twenty-one million, three hundred ten thousand, three hundred twenty-one".