212320400243 has 4 divisors (see below), whose sum is σ = 242651886000. Its totient is φ = 181988914488.

The previous prime is 212320400207. The next prime is 212320400251. The reversal of 212320400243 is 342004023212.

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 212320400243 - 2⁶ = 212320400179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212320400203) 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, 15165742868 + ... + 15165742881.

It is an arithmetic number, because the mean of its divisors is an integer number (60662971500).

Almost surely, 2^212320400243 is an apocalyptic number.

212320400243 is a deficient number, since it is larger than the sum of its proper divisors (30331485757).

212320400243 is an equidigital number, since it uses as much as digits as its factorization.

212320400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30331485756.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 212320400243 its reverse (342004023212), we get a palindrome (554324423455).

The spelling of 212320400243 in words is "two hundred twelve billion, three hundred twenty million, four hundred thousand, two hundred forty-three".