21302012222221 has 4 divisors (see below), whose sum is σ = 21302021708352. Its totient is φ = 21302002736092.

The previous prime is 21302012222213. The next prime is 21302012222299. The reversal of 21302012222221 is 12222221020312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21302012222221 - 2³ = 21302012222213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302012222192 and 21302012222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302012222021) 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, 732030 + ... + 6568096.

It is an arithmetic number, because the mean of its divisors is an integer number (5325505427088).

Almost surely, 2^{21302012222221} is an apocalyptic number.

It is an amenable number.

21302012222221 is a deficient number, since it is larger than the sum of its proper divisors (9486131).

21302012222221 is an equidigital number, since it uses as much as digits as its factorization.

21302012222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486130.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21302012222221 its reverse (12222221020312), we get a palindrome (33524233242533).

The spelling of 21302012222221 in words is "twenty-one trillion, three hundred two billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".