213119821 has 4 divisors (see below), whose sum is σ = 213465852. Its totient is φ = 212773792.

The previous prime is 213119813. The next prime is 213119873. The reversal of 213119821 is 128911312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9030025 + 204089796 = 3005^2 + 14286^2 .

It is a cyclic number.

It is not a de Polignac number, because 213119821 - 2³ = 213119813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213119821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213119321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172090 + ... + 173323.

It is an arithmetic number, because the mean of its divisors is an integer number (53366463).

Almost surely, 2^213119821 is an apocalyptic number.

It is an amenable number.

213119821 is a deficient number, since it is larger than the sum of its proper divisors (346031).

213119821 is an equidigital number, since it uses as much as digits as its factorization.

213119821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346030.

The product of its digits is 864, while the sum is 28.

The square root of 213119821 is about 14598.6239420022. The cubic root of 213119821 is about 597.3212256713.

It can be divided in two parts, 2131 and 19821, that added together give a cube (21952 = 28³).

The spelling of 213119821 in words is "two hundred thirteen million, one hundred nineteen thousand, eight hundred twenty-one".