211310221431 has 4 divisors (see below), whose sum is σ = 281746961912. Its totient is φ = 140873480952.

The previous prime is 211310221373. The next prime is 211310221433. The reversal of 211310221431 is 134122013112.

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

It is not a de Polignac number, because 211310221431 - 2²⁹ = 210773350519 is a prime.

It is a super-2 number, since 2×211310221431² (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 = 211310221398 and 211310221407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211310221433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35218370236 + ... + 35218370241.

It is an arithmetic number, because the mean of its divisors is an integer number (70436740478).

Almost surely, 2^211310221431 is an apocalyptic number.

211310221431 is a deficient number, since it is larger than the sum of its proper divisors (70436740481).

211310221431 is an equidigital number, since it uses as much as digits as its factorization.

211310221431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70436740480.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 211310221431 its reverse (134122013112), we get a palindrome (345432234543).

The spelling of 211310221431 in words is "two hundred eleven billion, three hundred ten million, two hundred twenty-one thousand, four hundred thirty-one".