2021837 has 2 divisors, whose sum is σ = 2021838. Its totient is φ = 2021836.

The previous prime is 2021807. The next prime is 2021839. The reversal of 2021837 is 7381202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 885481 = 1066^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021837 - 2¹⁴ = 2005453 is a prime.

Together with 2021839, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010918 + 1010919.

It is an arithmetic number, because the mean of its divisors is an integer number (1010919).

2^2021837 is an apocalyptic number.

It is an amenable number.

2021837 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021837 is an equidigital number, since it uses as much as digits as its factorization.

2021837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2021837 is about 1421.9131478399. The cubic root of 2021837 is about 126.4489944193.

The spelling of 2021837 in words is "two million, twenty-one thousand, eight hundred thirty-seven".