7057221 has 8 divisors (see below), whose sum is σ = 9421920. Its totient is φ = 4698672.

The previous prime is 7057201. The next prime is 7057229. The reversal of 7057221 is 1227507.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7057221 - 2⁶ = 7057157 is a prime.

7057221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7057191 and 7057200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7057229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550 + ... + 5168.

It is an arithmetic number, because the mean of its divisors is an integer number (1177740).

Almost surely, 2^7057221 is an apocalyptic number.

It is an amenable number.

7057221 is a deficient number, since it is larger than the sum of its proper divisors (2364699).

7057221 is a wasteful number, since it uses less digits than its factorization.

7057221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075.

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

The square root of 7057221 is about 2656.5430544224. The cubic root of 7057221 is about 191.8129417304.

It can be divided in two parts, 70 and 57221, that added together give a triangular number (57291 = T₃₃₈).

The spelling of 7057221 in words is "seven million, fifty-seven thousand, two hundred twenty-one".