221212112302321 has 24 divisors (see below), whose sum is σ = 258023857081320. Its totient is φ = 189097943956992.

The previous prime is 221212112302289. The next prime is 221212112302331. The reversal of 221212112302321 is 123203211212122.

It can be written as a sum of positive squares in 4 ways, for example, as 79408790367921 + 141803321934400 = 8911161^2 + 11908120^2 .

It is not a de Polignac number, because 221212112302321 - 2⁵ = 221212112302289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212112302331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1091565615 + ... + 1091768251.

It is an arithmetic number, because the mean of its divisors is an integer number (10750994045055).

Almost surely, 2^{221212112302321} is an apocalyptic number.

It is an amenable number.

221212112302321 is a deficient number, since it is larger than the sum of its proper divisors (36811744778999).

221212112302321 is a wasteful number, since it uses less digits than its factorization.

221212112302321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262753 (or 262746 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 221212112302321 its reverse (123203211212122), we get a palindrome (344415323514443).

The spelling of 221212112302321 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, three hundred two thousand, three hundred twenty-one".