2021820719 has 2 divisors, whose sum is σ = 2021820720. Its totient is φ = 2021820718.

The previous prime is 2021820701. The next prime is 2021820751. The reversal of 2021820719 is 9170281202.

It is a happy number.

It is an a-pointer prime, because the next prime (2021820751) can be obtained adding 2021820719 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021820719 is a prime.

It is a super-2 number, since 2×2021820719² = 8175518039555353922, which contains 22 as substring.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010910359 + 1010910360.

It is an arithmetic number, because the mean of its divisors is an integer number (1010910360).

Almost surely, 2^2021820719 is an apocalyptic number.

2021820719 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021820719 is an equidigital number, since it uses as much as digits as its factorization.

2021820719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 2021820719 is about 44964.6607793276. The cubic root of 2021820719 is about 1264.4865500490.

The spelling of 2021820719 in words is "two billion, twenty-one million, eight hundred twenty thousand, seven hundred nineteen".