213121219 has 2 divisors, whose sum is σ = 213121220. Its totient is φ = 213121218.

The previous prime is 213121217. The next prime is 213121229. The reversal of 213121219 is 912121312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213121219 - 2¹ = 213121217 is a prime.

It is a super-2 number, since 2×213121219² = 90841307976091922, which contains 22 as substring.

Together with 213121217, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 213121219.

It is not a weakly prime, because it can be changed into another prime (213121213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560609 + 106560610.

It is an arithmetic number, because the mean of its divisors is an integer number (106560610).

Almost surely, 2^213121219 is an apocalyptic number.

213121219 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121219 is an equidigital number, since it uses as much as digits as its factorization.

213121219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 22.

The square root of 213121219 is about 14598.6718231488. The cubic root of 213121219 is about 597.3225317492.

The spelling of 213121219 in words is "two hundred thirteen million, one hundred twenty-one thousand, two hundred nineteen".