2111721019 has 2 divisors, whose sum is σ = 2111721020. Its totient is φ = 2111721018.

The previous prime is 2111720999. The next prime is 2111721037. The reversal of 2111721019 is 9101271112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2111721019 - 2⁵ = 2111720987 is a prime.

It is a super-2 number, since 2×2111721019² = 8918731324172796722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2111720984 and 2111721002.

It is not a weakly prime, because it can be changed into another prime (2111721089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055860509 + 1055860510.

It is an arithmetic number, because the mean of its divisors is an integer number (1055860510).

Almost surely, 2^2111721019 is an apocalyptic number.

2111721019 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111721019 is an equidigital number, since it uses as much as digits as its factorization.

2111721019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 25.

The square root of 2111721019 is about 45953.4657996543. The cubic root of 2111721019 is about 1282.9572370148.

The spelling of 2111721019 in words is "two billion, one hundred eleven million, seven hundred twenty-one thousand, nineteen".