7257021 has 4 divisors (see below), whose sum is σ = 9676032. Its totient is φ = 4838012.

The previous prime is 7257017. The next prime is 7257023. The reversal of 7257021 is 1207527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7257021 - 2² = 7257017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7256982 and 7257000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7257023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1209501 + ... + 1209506.

It is an arithmetic number, because the mean of its divisors is an integer number (2419008).

Almost surely, 2^7257021 is an apocalyptic number.

It is an amenable number.

7257021 is a deficient number, since it is larger than the sum of its proper divisors (2419011).

7257021 is a wasteful number, since it uses less digits than its factorization.

7257021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419010.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 7257021 is about 2693.8858550429. The cubic root of 7257021 is about 193.6062887133.

The spelling of 7257021 in words is "seven million, two hundred fifty-seven thousand, twenty-one".