212131321243 has 4 divisors (see below), whose sum is σ = 212137552528. Its totient is φ = 212125089960.

The previous prime is 212131321231. The next prime is 212131321271. The reversal of 212131321243 is 342123131212.

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 212131321243 - 2¹⁷ = 212131190171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212131321943) 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, 3064296 + ... + 3132757.

It is an arithmetic number, because the mean of its divisors is an integer number (53034388132).

Almost surely, 2^212131321243 is an apocalyptic number.

212131321243 is a deficient number, since it is larger than the sum of its proper divisors (6231285).

212131321243 is an equidigital number, since it uses as much as digits as its factorization.

212131321243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231284.

The product of its digits is 1728, while the sum is 25.

Adding to 212131321243 its reverse (342123131212), we get a palindrome (554254452455).

The spelling of 212131321243 in words is "two hundred twelve billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred forty-three".