21302221233 has 16 divisors (see below), whose sum is σ = 29186566976. Its totient is φ = 13810098240.

The previous prime is 21302221231. The next prime is 21302221247. The reversal of 21302221233 is 33212220312.

It is a happy number.

It is not a de Polignac number, because 21302221233 - 2¹ = 21302221231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21302221231) 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 15 ways as a sum of consecutive naturals, for example, 155010 + ... + 258132.

It is an arithmetic number, because the mean of its divisors is an integer number (1824160436).

Almost surely, 2^21302221233 is an apocalyptic number.

It is an amenable number.

21302221233 is a deficient number, since it is larger than the sum of its proper divisors (7884345743).

21302221233 is a wasteful number, since it uses less digits than its factorization.

21302221233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105024.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21302221233 its reverse (33212220312), we get a palindrome (54514441545).

The spelling of 21302221233 in words is "twenty-one billion, three hundred two million, two hundred twenty-one thousand, two hundred thirty-three".