213323131987 has 4 divisors (see below), whose sum is σ = 243797865136. Its totient is φ = 182848398840.

The previous prime is 213323131939. The next prime is 213323131991. The reversal of 213323131987 is 789131323312.

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 213323131987 - 2¹⁹ = 213322607699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213323131937) 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, 15237366564 + ... + 15237366577.

It is an arithmetic number, because the mean of its divisors is an integer number (60949466284).

Almost surely, 2^213323131987 is an apocalyptic number.

213323131987 is a deficient number, since it is larger than the sum of its proper divisors (30474733149).

213323131987 is an equidigital number, since it uses as much as digits as its factorization.

213323131987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30474733148.

The product of its digits is 163296, while the sum is 43.

The spelling of 213323131987 in words is "two hundred thirteen billion, three hundred twenty-three million, one hundred thirty-one thousand, nine hundred eighty-seven".