2021719 has 4 divisors (see below), whose sum is σ = 2310544. Its totient is φ = 1732896.

The previous prime is 2021711. The next prime is 2021729. The reversal of 2021719 is 9171202.

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

It is a cyclic number.

It is not a de Polignac number, because 2021719 - 2³ = 2021711 is a prime.

It is a super-2 number, since 2×2021719² = 8174695429922, which contains 22 as substring.

It is a Duffinian number.

2021719 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144402 + ... + 144415.

It is an arithmetic number, because the mean of its divisors is an integer number (577636).

2^2021719 is an apocalyptic number.

2021719 is a deficient number, since it is larger than the sum of its proper divisors (288825).

2021719 is an equidigital number, since it uses as much as digits as its factorization.

2021719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288824.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2021719 is about 1421.8716538422. The cubic root of 2021719 is about 126.4465344004.

The spelling of 2021719 in words is "two million, twenty-one thousand, seven hundred nineteen".