211323311031 has 16 divisors (see below), whose sum is σ = 332404103168. Its totient is φ = 116860816800.

The previous prime is 211323311029. The next prime is 211323311131. The reversal of 211323311031 is 130113323112.

It is a happy number.

It is not a de Polignac number, because 211323311031 - 2¹ = 211323311029 is a prime.

It is a super-2 number, since 2×211323311031² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211323310989 and 211323311007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211323311131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162306040 + ... + 162307341.

It is an arithmetic number, because the mean of its divisors is an integer number (20775256448).

Almost surely, 2^211323311031 is an apocalyptic number.

211323311031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211323311031 is a deficient number, since it is larger than the sum of its proper divisors (121080792137).

211323311031 is a wasteful number, since it uses less digits than its factorization.

211323311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324613422.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 211323311031 its reverse (130113323112), we get a palindrome (341436634143).

The spelling of 211323311031 in words is "two hundred eleven billion, three hundred twenty-three million, three hundred eleven thousand, thirty-one".