21302323223221 has 32 divisors (see below), whose sum is σ = 22750581611520. Its totient is φ = 19899477835776.

The previous prime is 21302323223197. The next prime is 21302323223261. The reversal of 21302323223221 is 12232232320312.

It is not a de Polignac number, because 21302323223221 - 2³⁵ = 21267963484853 is a prime.

It is a super-2 number, since 2×21302323223221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21302323223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302323223261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1806960195 + ... + 1806971983.

It is an arithmetic number, because the mean of its divisors is an integer number (710955675360).

Almost surely, 2^{21302323223221} is an apocalyptic number.

It is an amenable number.

21302323223221 is a deficient number, since it is larger than the sum of its proper divisors (1448258388299).

21302323223221 is a wasteful number, since it uses less digits than its factorization.

21302323223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15333.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21302323223221 its reverse (12232232320312), we get a palindrome (33534555543533).

The spelling of 21302323223221 in words is "twenty-one trillion, three hundred two billion, three hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".