213999 has 4 divisors (see below), whose sum is σ = 285336. Its totient is φ = 142664.

The previous prime is 213989. The next prime is 214003. The reversal of 213999 is 999312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213999 is a prime.

It is a D-number.

213999 is a modest number, since divided by 999 gives 213 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213919) 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, 35664 + ... + 35669.

It is an arithmetic number, because the mean of its divisors is an integer number (71334).

2²¹³⁹⁹⁹ is an apocalyptic number.

213999 is a deficient number, since it is larger than the sum of its proper divisors (71337).

213999 is an equidigital number, since it uses as much as digits as its factorization.

213999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71336.

The product of its digits is 4374, while the sum is 33.

The square root of 213999 is about 462.6002594033. The cubic root of 213999 is about 59.8141471285.

The spelling of 213999 in words is "two hundred thirteen thousand, nine hundred ninety-nine".