221212304002321 has 4 divisors (see below), whose sum is σ = 221215656125412. Its totient is φ = 221208951879232.

The previous prime is 221212304002309. The next prime is 221212304002441. The reversal of 221212304002321 is 123200403212122.

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 201884313960000 + 19327990042321 = 14208600^2 + 4396361^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212304002321 - 2⁵ = 221212304002289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212304002021) 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, 1675962556 + ... + 1676094541.

It is an arithmetic number, because the mean of its divisors is an integer number (55303914031353).

Almost surely, 2^{221212304002321} is an apocalyptic number.

It is an amenable number.

221212304002321 is a deficient number, since it is larger than the sum of its proper divisors (3352123091).

221212304002321 is an equidigital number, since it uses as much as digits as its factorization.

221212304002321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352123090.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 221212304002321 its reverse (123200403212122), we get a palindrome (344412707214443).

The spelling of 221212304002321 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred four million, two thousand, three hundred twenty-one".