7505021 has 2 divisors, whose sum is σ = 7505022. Its totient is φ = 7505020.

The previous prime is 7505011. The next prime is 7505023. The reversal of 7505021 is 1205057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5712100 + 1792921 = 2390^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 7505021 - 2⁶ = 7504957 is a prime.

It is a super-3 number, since 3×7505021³ (a number of 22 digits) contains 333 as substring.

Together with 7505023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7504984 and 7505002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7505023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3752510 + 3752511.

It is an arithmetic number, because the mean of its divisors is an integer number (3752511).

Almost surely, 2^7505021 is an apocalyptic number.

It is an amenable number.

7505021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7505021 is an equidigital number, since it uses as much as digits as its factorization.

7505021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 7505021 is about 2739.5293391384. The cubic root of 7505021 is about 195.7870535375.

The spelling of 7505021 in words is "seven million, five hundred five thousand, twenty-one".