212021223031 has 4 divisors (see below), whose sum is σ = 216951949192. Its totient is φ = 207090496872.

The previous prime is 212021223019. The next prime is 212021223047. The reversal of 212021223031 is 130322120212.

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 212021223031 - 2³³ = 203431288439 is a prime.

It is a super-2 number, since 2×212021223031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021223731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2465363016 + ... + 2465363101.

It is an arithmetic number, because the mean of its divisors is an integer number (54237987298).

Almost surely, 2^212021223031 is an apocalyptic number.

212021223031 is a deficient number, since it is larger than the sum of its proper divisors (4930726161).

212021223031 is an equidigital number, since it uses as much as digits as its factorization.

212021223031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930726160.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212021223031 its reverse (130322120212), we get a palindrome (342343343243).

The spelling of 212021223031 in words is "two hundred twelve billion, twenty-one million, two hundred twenty-three thousand, thirty-one".