2021201989 has 2 divisors, whose sum is σ = 2021201990. Its totient is φ = 2021201988.

The previous prime is 2021201977. The next prime is 2021202017. The reversal of 2021201989 is 9891021202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1812630625 + 208571364 = 42575^2 + 14442^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021201989 - 2¹¹ = 2021199941 is a prime.

It is a super-2 number, since 2×2021201989² = 8170514960675112242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021201909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010600994 + 1010600995.

It is an arithmetic number, because the mean of its divisors is an integer number (1010600995).

Almost surely, 2^2021201989 is an apocalyptic number.

It is an amenable number.

2021201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021201989 is an equidigital number, since it uses as much as digits as its factorization.

2021201989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 2021201989 is about 44957.7800719742. The cubic root of 2021201989 is about 1264.3575482408.

The spelling of 2021201989 in words is "two billion, twenty-one million, two hundred one thousand, nine hundred eighty-nine".