2121013819 has 2 divisors, whose sum is σ = 2121013820. Its totient is φ = 2121013818.

The previous prime is 2121013777. The next prime is 2121013849. The reversal of 2121013819 is 9183101212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121013819 is a prime.

It is a super-2 number, since 2×2121013819² = 8997399240777929522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2121013849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060506909 + 1060506910.

It is an arithmetic number, because the mean of its divisors is an integer number (1060506910).

Almost surely, 2^2121013819 is an apocalyptic number.

2121013819 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121013819 is an equidigital number, since it uses as much as digits as its factorization.

2121013819 is an evil number, because the sum of its binary digits is even.

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

The square root of 2121013819 is about 46054.4657878039. The cubic root of 2121013819 is about 1284.8364024343.

The spelling of 2121013819 in words is "two billion, one hundred twenty-one million, thirteen thousand, eight hundred nineteen".