662021 has 2 divisors, whose sum is σ = 662022. Its totient is φ = 662020.

The previous prime is 662003. The next prime is 662029. The reversal of 662021 is 120266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 45796 = 785^2 + 214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331010 + 331011.

It is an arithmetic number, because the mean of its divisors is an integer number (331011).

2⁶⁶²⁰²¹ is an apocalyptic number.

It is an amenable number.

662021 is a deficient number, since it is larger than the sum of its proper divisors (1).

662021 is an equidigital number, since it uses as much as digits as its factorization.

662021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 662021 is about 813.6467292382. The cubic root of 662021 is about 87.1546551129.

Adding to 662021 its reverse (120266), we get a palindrome (782287).

It can be divided in two parts, 66 and 2021, that multiplied together give a triangular number (133386 = T₅₁₆).

The spelling of 662021 in words is "six hundred sixty-two thousand, twenty-one".