212113223031 has 4 divisors (see below), whose sum is σ = 282817630712. Its totient is φ = 141408815352.

The previous prime is 212113223029. The next prime is 212113223039. The reversal of 212113223031 is 130322311212.

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

It is not a de Polignac number, because 212113223031 - 2¹ = 212113223029 is a prime.

It is a super-2 number, since 2×212113223031² (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 = 212113222989 and 212113223007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212113223039) 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, 35352203836 + ... + 35352203841.

It is an arithmetic number, because the mean of its divisors is an integer number (70704407678).

Almost surely, 2^212113223031 is an apocalyptic number.

212113223031 is a deficient number, since it is larger than the sum of its proper divisors (70704407681).

212113223031 is an equidigital number, since it uses as much as digits as its factorization.

212113223031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70704407680.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 212113223031 its reverse (130322311212), we get a palindrome (342435534243).

The spelling of 212113223031 in words is "two hundred twelve billion, one hundred thirteen million, two hundred twenty-three thousand, thirty-one".