7960021 has 2 divisors, whose sum is σ = 7960022. Its totient is φ = 7960020.

The previous prime is 7960019. The next prime is 7960033. The reversal of 7960021 is 1200697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4157521 + 3802500 = 2039^2 + 1950^2 .

It is an emirp because it is prime and its reverse (1200697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7960021 - 2¹ = 7960019 is a prime.

Together with 7960019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7960081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3980010 + 3980011.

It is an arithmetic number, because the mean of its divisors is an integer number (3980011).

Almost surely, 2^7960021 is an apocalyptic number.

It is an amenable number.

7960021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7960021 is an equidigital number, since it uses as much as digits as its factorization.

7960021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 7960021 is about 2821.3509175570. The cubic root of 7960021 is about 199.6662851484. Note that the first 3 decimals are identical.

The spelling of 7960021 in words is "seven million, nine hundred sixty thousand, twenty-one".