2021989433 has 2 divisors, whose sum is σ = 2021989434. Its totient is φ = 2021989432.

The previous prime is 2021989429. The next prime is 2021989447. The reversal of 2021989433 is 3349891202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1747490809 + 274498624 = 41803^2 + 16568^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021989433 - 2² = 2021989429 is a prime.

It is a super-2 number, since 2×2021989433² = 8176882534327322978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021989483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010994716 + 1010994717.

It is an arithmetic number, because the mean of its divisors is an integer number (1010994717).

Almost surely, 2^2021989433 is an apocalyptic number.

It is an amenable number.

2021989433 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021989433 is an equidigital number, since it uses as much as digits as its factorization.

2021989433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 2021989433 is about 44966.5368135017. The cubic root of 2021989433 is about 1264.5217214249.

The spelling of 2021989433 in words is "two billion, twenty-one million, nine hundred eighty-nine thousand, four hundred thirty-three".