2021021269 has 2 divisors, whose sum is σ = 2021021270. Its totient is φ = 2021021268.

The previous prime is 2021021257. The next prime is 2021021311. The reversal of 2021021269 is 9621201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053002500 + 968018769 = 32450^2 + 31113^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021021269 - 2⁵ = 2021021237 is a prime.

It is a super-2 number, since 2×2021021269² = 8169053939500740722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021021239) 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, 1010510634 + 1010510635.

It is an arithmetic number, because the mean of its divisors is an integer number (1010510635).

Almost surely, 2^2021021269 is an apocalyptic number.

It is an amenable number.

2021021269 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021021269 is an equidigital number, since it uses as much as digits as its factorization.

2021021269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 2021021269 is about 44955.7701413289. The cubic root of 2021021269 is about 1264.3198641452.

The spelling of 2021021269 in words is "two billion, twenty-one million, twenty-one thousand, two hundred sixty-nine".