213231212131 has 8 divisors (see below), whose sum is σ = 243696556800. Its totient is φ = 182766803208.

The previous prime is 213231212123. The next prime is 213231212137. The reversal of 213231212131 is 131212132312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213231212131 - 2³ = 213231212123 is a prime.

It is a super-2 number, since 2×213231212131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213231212137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352320 + ... + 742018.

It is an arithmetic number, because the mean of its divisors is an integer number (30462069600).

Almost surely, 2^213231212131 is an apocalyptic number.

213231212131 is a deficient number, since it is larger than the sum of its proper divisors (30465344669).

213231212131 is an equidigital number, since it uses as much as digits as its factorization.

213231212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467873.

The product of its digits is 432, while the sum is 22.

Adding to 213231212131 its reverse (131212132312), we get a palindrome (344443344443).

The spelling of 213231212131 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred twelve thousand, one hundred thirty-one".