213131123099 has 4 divisors (see below), whose sum is σ = 213133362960. Its totient is φ = 213128883240.

The previous prime is 213131123083. The next prime is 213131123119. The reversal of 213131123099 is 990321131312.

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 213131123099 - 2⁴ = 213131123083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213131123069) 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 3 ways as a sum of consecutive naturals, for example, 970559 + ... + 1169720.

It is an arithmetic number, because the mean of its divisors is an integer number (53283340740).

Almost surely, 2^213131123099 is an apocalyptic number.

213131123099 is a deficient number, since it is larger than the sum of its proper divisors (2239861).

213131123099 is an equidigital number, since it uses as much as digits as its factorization.

213131123099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239860.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 213131123099 in words is "two hundred thirteen billion, one hundred thirty-one million, one hundred twenty-three thousand, ninety-nine".