2021120641 has 2 divisors, whose sum is σ = 2021120642. Its totient is φ = 2021120640.

The previous prime is 2021120639. The next prime is 2021120657. The reversal of 2021120641 is 1460211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1654781041 + 366339600 = 40679^2 + 19140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021120641 - 2¹ = 2021120639 is a prime.

Together with 2021120639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2021120741) 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, 1010560320 + 1010560321.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560321).

Almost surely, 2^2021120641 is an apocalyptic number.

It is an amenable number.

2021120641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021120641 is an equidigital number, since it uses as much as digits as its factorization.

2021120641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2021120641 is about 44956.8753473815. The cubic root of 2021120641 is about 1264.3405856712.

Adding to 2021120641 its reverse (1460211202), we get a palindrome (3481331843).

The spelling of 2021120641 in words is "two billion, twenty-one million, one hundred twenty thousand, six hundred forty-one".