213121321199 has 4 divisors (see below), whose sum is σ = 219996202560. Its totient is φ = 206246439840.

The previous prime is 213121321129. The next prime is 213121321241. The reversal of 213121321199 is 991123121312.

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 213121321199 - 2¹⁶ = 213121255663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121321109) 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, 3437440634 + ... + 3437440695.

It is an arithmetic number, because the mean of its divisors is an integer number (54999050640).

Almost surely, 2^213121321199 is an apocalyptic number.

213121321199 is a deficient number, since it is larger than the sum of its proper divisors (6874881361).

213121321199 is an equidigital number, since it uses as much as digits as its factorization.

213121321199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874881360.

The product of its digits is 5832, while the sum is 35.

The spelling of 213121321199 in words is "two hundred thirteen billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred ninety-nine".