211231321243 has 4 divisors (see below), whose sum is σ = 211265836648. Its totient is φ = 211196805840.

The previous prime is 211231321219. The next prime is 211231321253. The reversal of 211231321243 is 342123132112.

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 211231321243 - 2⁵ = 211231321211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211231321253) 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, 17248521 + ... + 17260762.

It is an arithmetic number, because the mean of its divisors is an integer number (52816459162).

Almost surely, 2^211231321243 is an apocalyptic number.

211231321243 is a deficient number, since it is larger than the sum of its proper divisors (34515405).

211231321243 is an equidigital number, since it uses as much as digits as its factorization.

211231321243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34515404.

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

Adding to 211231321243 its reverse (342123132112), we get a palindrome (553354453355).

The spelling of 211231321243 in words is "two hundred eleven billion, two hundred thirty-one million, three hundred twenty-one thousand, two hundred forty-three".