211312431431 has 4 divisors (see below), whose sum is σ = 211474606512. Its totient is φ = 211150256352.

The previous prime is 211312431403. The next prime is 211312431433. The reversal of 211312431431 is 134134213112.

211312431431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211312431431 - 2²⁶ = 211245322567 is a prime.

It is a super-2 number, since 2×211312431431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211312431431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211312431433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81085586 + ... + 81088191.

It is an arithmetic number, because the mean of its divisors is an integer number (52868651628).

Almost surely, 2^211312431431 is an apocalyptic number.

211312431431 is a deficient number, since it is larger than the sum of its proper divisors (162175081).

211312431431 is a wasteful number, since it uses less digits than its factorization.

211312431431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162175080.

The product of its digits is 1728, while the sum is 26.

Adding to 211312431431 its reverse (134134213112), we get a palindrome (345446644543).

The spelling of 211312431431 in words is "two hundred eleven billion, three hundred twelve million, four hundred thirty-one thousand, four hundred thirty-one".