2021121329 has 2 divisors, whose sum is σ = 2021121330. Its totient is φ = 2021121328.

The previous prime is 2021121293. The next prime is 2021121367. The reversal of 2021121329 is 9231211202.

It is a happy number.

Together with previous prime (2021121293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1924138225 + 96983104 = 43865^2 + 9848^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021121329 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021126329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560664 + 1010560665.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560665).

Almost surely, 2^2021121329 is an apocalyptic number.

It is an amenable number.

2021121329 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121329 is an equidigital number, since it uses as much as digits as its factorization.

2021121329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2021121329 is about 44956.8829991582. The cubic root of 2021121329 is about 1264.3407291339.

The spelling of 2021121329 in words is "two billion, twenty-one million, one hundred twenty-one thousand, three hundred twenty-nine".