7125021 has 12 divisors (see below), whose sum is σ = 10543260. Its totient is φ = 4633920.

The previous prime is 7124993. The next prime is 7125037. The reversal of 7125021 is 1205217.

7125021 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 622521 + 6502500 = 789^2 + 2550^2 .

It is not a de Polignac number, because 7125021 - 2¹⁴ = 7108637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7124985 and 7125003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7125061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9286 + ... + 10023.

It is an arithmetic number, because the mean of its divisors is an integer number (878605).

Almost surely, 2^7125021 is an apocalyptic number.

It is an amenable number.

7125021 is a deficient number, since it is larger than the sum of its proper divisors (3418239).

7125021 is a wasteful number, since it uses less digits than its factorization.

7125021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356 (or 19353 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 7125021 is about 2669.2734966653. The cubic root of 7125021 is about 192.4252456128.

The spelling of 7125021 in words is "seven million, one hundred twenty-five thousand, twenty-one".