7982021 has 2 divisors, whose sum is σ = 7982022. Its totient is φ = 7982020.

The previous prime is 7982017. The next prime is 7982053. The reversal of 7982021 is 1202897.

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., 7365796 + 616225 = 2714^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 7982021 - 2² = 7982017 is a prime.

It is a Chen prime.

It is an Ulam number.

It is equal to p₅₃₈₆₅₂ and since 7982021 and 538652 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7981021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3991010 + 3991011.

It is an arithmetic number, because the mean of its divisors is an integer number (3991011).

Almost surely, 2^7982021 is an apocalyptic number.

It is an amenable number.

7982021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7982021 is an equidigital number, since it uses as much as digits as its factorization.

7982021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 7982021 is about 2825.2470688419. The cubic root of 7982021 is about 199.8500626220.

The spelling of 7982021 in words is "seven million, nine hundred eighty-two thousand, twenty-one".