7421021 has 2 divisors, whose sum is σ = 7421022. Its totient is φ = 7421020.

The previous prime is 7421017. The next prime is 7421033. The reversal of 7421021 is 1201247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7365796 + 55225 = 2714^2 + 235^2 .

It is an emirp because it is prime and its reverse (1201247) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7421021 - 2² = 7421017 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 (7429021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710510 + 3710511.

It is an arithmetic number, because the mean of its divisors is an integer number (3710511).

Almost surely, 2^7421021 is an apocalyptic number.

It is an amenable number.

7421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7421021 is an equidigital number, since it uses as much as digits as its factorization.

7421021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 7421021 is about 2724.1550983745. The cubic root of 7421021 is about 195.0538619566.

Adding to 7421021 its reverse (1201247), we get a palindrome (8622268).

The spelling of 7421021 in words is "seven million, four hundred twenty-one thousand, twenty-one".