2015021 has 2 divisors, whose sum is σ = 2015022. Its totient is φ = 2015020.

The previous prime is 2015011. The next prime is 2015033. The reversal of 2015021 is 1205102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 15625 = 1414^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015021 - 2¹⁴ = 1998637 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2014993 and 2015011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2015011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007510 + 1007511.

It is an arithmetic number, because the mean of its divisors is an integer number (1007511).

2^2015021 is an apocalyptic number.

It is an amenable number.

2015021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015021 is an equidigital number, since it uses as much as digits as its factorization.

2015021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2015021 is about 1419.5143535731. The cubic root of 2015021 is about 126.3067398457.

The spelling of 2015021 in words is "two million, fifteen thousand, twenty-one".