2021019997 has 2 divisors, whose sum is σ = 2021019998. Its totient is φ = 2021019996.

The previous prime is 2021019953. The next prime is 2021020003. The reversal of 2021019997 is 7999101202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1903925956 + 117094041 = 43634^2 + 10821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021019997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021019097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010509998 + 1010509999.

It is an arithmetic number, because the mean of its divisors is an integer number (1010509999).

Almost surely, 2^2021019997 is an apocalyptic number.

It is an amenable number.

2021019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021019997 is an equidigital number, since it uses as much as digits as its factorization.

2021019997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 2021019997 is about 44955.7559940882. The cubic root of 2021019997 is about 1264.3195988973.

The spelling of 2021019997 in words is "two billion, twenty-one million, nineteen thousand, nine hundred ninety-seven".