213431312099 has 4 divisors (see below), whose sum is σ = 213446410800. Its totient is φ = 213416213400.

The previous prime is 213431312009. The next prime is 213431312111. The reversal of 213431312099 is 990213134312.

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 213431312099 - 2⁸ = 213431311843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213431312009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7528127 + ... + 7556424.

It is an arithmetic number, because the mean of its divisors is an integer number (53361602700).

Almost surely, 2^213431312099 is an apocalyptic number.

213431312099 is a deficient number, since it is larger than the sum of its proper divisors (15098701).

213431312099 is a wasteful number, since it uses less digits than its factorization.

213431312099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15098700.

The product of its (nonzero) digits is 34992, while the sum is 38.

It can be divided in two parts, 2134313 and 12099, that added together give a palindrome (2146412).

The spelling of 213431312099 in words is "two hundred thirteen billion, four hundred thirty-one million, three hundred twelve thousand, ninety-nine".