2121020219 has 2 divisors, whose sum is σ = 2121020220. Its totient is φ = 2121020218.

The previous prime is 2121020201. The next prime is 2121020221. The reversal of 2121020219 is 9120201212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121020219 - 2²⁴ = 2104243003 is a prime.

It is a super-2 number, since 2×2121020219² = 8997453538813615922, which contains 22 as substring.

Together with 2121020221, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020219.

It is not a weakly prime, because it can be changed into another prime (2121020119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510109 + 1060510110.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510110).

Almost surely, 2^2121020219 is an apocalyptic number.

2121020219 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121020219 is an equidigital number, since it uses as much as digits as its factorization.

2121020219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2121020219 is about 46054.5352706984. The cubic root of 2121020219 is about 1284.8376947321.

The spelling of 2121020219 in words is "two billion, one hundred twenty-one million, twenty thousand, two hundred nineteen".