212221321031 has 4 divisors (see below), whose sum is σ = 212222887200. Its totient is φ = 212219754864.

The previous prime is 212221321003. The next prime is 212221321043. The reversal of 212221321031 is 130123122212.

212221321031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212221321031 - 2³⁰ = 211147579207 is a prime.

It is a super-2 number, since 2×212221321031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212221320994 and 212221321012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221321051) 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 3 ways as a sum of consecutive naturals, for example, 558326 + ... + 858003.

It is an arithmetic number, because the mean of its divisors is an integer number (53055721800).

Almost surely, 2^212221321031 is an apocalyptic number.

212221321031 is a deficient number, since it is larger than the sum of its proper divisors (1566169).

212221321031 is a wasteful number, since it uses less digits than its factorization.

212221321031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566168.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 212221321031 its reverse (130123122212), we get a palindrome (342344443243).

The spelling of 212221321031 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred twenty-one thousand, thirty-one".