21022310321 has 4 divisors (see below), whose sum is σ = 21024370932. Its totient is φ = 21020249712.

The previous prime is 21022310317. The next prime is 21022310329. The reversal of 21022310321 is 12301322012.

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 5785123600 + 15237186721 = 76060^2 + 123439^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022310321 - 2² = 21022310317 is a prime.

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 21022310321.

It is not an unprimeable number, because it can be changed into a prime (21022310329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1014926 + ... + 1035431.

It is an arithmetic number, because the mean of its divisors is an integer number (5256092733).

Almost surely, 2^21022310321 is an apocalyptic number.

It is an amenable number.

21022310321 is a deficient number, since it is larger than the sum of its proper divisors (2060611).

21022310321 is a wasteful number, since it uses less digits than its factorization.

21022310321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060610.

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

Adding to 21022310321 its reverse (12301322012), we get a palindrome (33323632333).

The spelling of 21022310321 in words is "twenty-one billion, twenty-two million, three hundred ten thousand, three hundred twenty-one".