2860021 has 2 divisors, whose sum is σ = 2860022. Its totient is φ = 2860020.

The previous prime is 2860019. The next prime is 2860043. The reversal of 2860021 is 1200682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 255025 = 1614^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2860021 - 2¹ = 2860019 is a prime.

Together with 2860019, it forms a pair of twin primes.

It is a Chen prime.

2860021 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2860061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1430010 + 1430011.

It is an arithmetic number, because the mean of its divisors is an integer number (1430011).

2^2860021 is an apocalyptic number.

It is an amenable number.

2860021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2860021 is an equidigital number, since it uses as much as digits as its factorization.

2860021 is an evil number, because the sum of its binary digits is even.

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

The square root of 2860021 is about 1691.1596612975. The cubic root of 2860021 is about 141.9459723049.

The spelling of 2860021 in words is "two million, eight hundred sixty thousand, twenty-one".