213511543231 has 16 divisors (see below), whose sum is σ = 258381398016. Its totient is φ = 172234947456.

The previous prime is 213511543229. The next prime is 213511543249. The reversal of 213511543231 is 132345115312.

It is a cyclic number.

It is not a de Polignac number, because 213511543231 - 2¹ = 213511543229 is a prime.

It is a super-2 number, since 2×213511543231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213511543193 and 213511543202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213511543831) 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, 2718150 + ... + 2795596.

It is an arithmetic number, because the mean of its divisors is an integer number (16148837376).

Almost surely, 2^213511543231 is an apocalyptic number.

213511543231 is a deficient number, since it is larger than the sum of its proper divisors (44869854785).

213511543231 is a wasteful number, since it uses less digits than its factorization.

213511543231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100638.

The product of its digits is 10800, while the sum is 31.

Adding to 213511543231 its reverse (132345115312), we get a palindrome (345856658543).

The spelling of 213511543231 in words is "two hundred thirteen billion, five hundred eleven million, five hundred forty-three thousand, two hundred thirty-one".