212221320331 has 4 divisors (see below), whose sum is σ = 215388802792. Its totient is φ = 209053837872.

The previous prime is 212221320319. The next prime is 212221320341. The reversal of 212221320331 is 133023122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212221320331 - 2¹³ = 212221312139 is a prime.

It is a super-2 number, since 2×212221320331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221320341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1583741130 + ... + 1583741263.

It is an arithmetic number, because the mean of its divisors is an integer number (53847200698).

Almost surely, 2^212221320331 is an apocalyptic number.

212221320331 is a deficient number, since it is larger than the sum of its proper divisors (3167482461).

212221320331 is an equidigital number, since it uses as much as digits as its factorization.

212221320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167482460.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 212221320331 its reverse (133023122212), we get a palindrome (345244442543).

The spelling of 212221320331 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred twenty thousand, three hundred thirty-one".