211431034231 has 4 divisors (see below), whose sum is σ = 213370768600. Its totient is φ = 209491299864.

The previous prime is 211431034183. The next prime is 211431034247. The reversal of 211431034231 is 132430134112.

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 211431034231 - 2²¹ = 211428937079 is a prime.

It is a super-2 number, since 2×211431034231² (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 = 211431034196 and 211431034205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211431034631) 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, 969867021 + ... + 969867238.

It is an arithmetic number, because the mean of its divisors is an integer number (53342692150).

Almost surely, 2^211431034231 is an apocalyptic number.

211431034231 is a deficient number, since it is larger than the sum of its proper divisors (1939734369).

211431034231 is a wasteful number, since it uses less digits than its factorization.

211431034231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939734368.

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

Adding to 211431034231 its reverse (132430134112), we get a palindrome (343861168343).

The spelling of 211431034231 in words is "two hundred eleven billion, four hundred thirty-one million, thirty-four thousand, two hundred thirty-one".