213131231109 has 24 divisors (see below), whose sum is σ = 311182646112. Its totient is φ = 140554735200.

The previous prime is 213131231107. The next prime is 213131231111. The reversal of 213131231109 is 901132131312.

213131231109 is a `hidden beast` number, since 2 + 1 + 31 + 312 + 311 + 0 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (213131231107) and next prime (213131231111).

It is not a de Polignac number, because 213131231109 - 2¹ = 213131231107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213131231107) 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 23 ways as a sum of consecutive naturals, for example, 916414 + ... + 1125200.

It is an arithmetic number, because the mean of its divisors is an integer number (12965943588).

Almost surely, 2^213131231109 is an apocalyptic number.

It is an amenable number.

213131231109 is a deficient number, since it is larger than the sum of its proper divisors (98051415003).

213131231109 is a wasteful number, since it uses less digits than its factorization.

213131231109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210017 (or 210014 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 213131231109 in words is "two hundred thirteen billion, one hundred thirty-one million, two hundred thirty-one thousand, one hundred nine".