2021021319949 has 2 divisors, whose sum is σ = 2021021319950. Its totient is φ = 2021021319948.

The previous prime is 2021021319929. The next prime is 2021021320051. The reversal of 2021021319949 is 9499131201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1728286217449 + 292735102500 = 1314643^2 + 541050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021021319949 - 2⁹ = 2021021319437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021021319929) 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, 1010510659974 + 1010510659975.

It is an arithmetic number, because the mean of its divisors is an integer number (1010510659975).

Almost surely, 2^{2021021319949} is an apocalyptic number.

It is an amenable number.

2021021319949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021021319949 is an equidigital number, since it uses as much as digits as its factorization.

2021021319949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 2021021319949 in words is "two trillion, twenty-one billion, twenty-one million, three hundred nineteen thousand, nine hundred forty-nine".