7357221 has 12 divisors (see below), whose sum is σ = 10657920. Its totient is φ = 4890600.

The previous prime is 7357219. The next prime is 7357223. The reversal of 7357221 is 1227537.

7357221 is a `hidden beast` number, since 73 + 572 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (7357219) and next prime (7357223).

It is not a de Polignac number, because 7357221 - 2¹ = 7357219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7357223) 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, 2796 + ... + 4746.

It is an arithmetic number, because the mean of its divisors is an integer number (888160).

Almost surely, 2^7357221 is an apocalyptic number.

It is an amenable number.

7357221 is a deficient number, since it is larger than the sum of its proper divisors (3300699).

7357221 is a wasteful number, since it uses less digits than its factorization.

7357221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376 (or 2373 counting only the distinct ones).

The product of its digits is 2940, while the sum is 27.

The square root of 7357221 is about 2712.4197683987. The cubic root of 7357221 is about 194.4932800572.

The spelling of 7357221 in words is "seven million, three hundred fifty-seven thousand, two hundred twenty-one".