7220521 has 16 divisors (see below), whose sum is σ = 9123840. Its totient is φ = 5550480.

The previous prime is 7220519. The next prime is 7220531. The reversal of 7220521 is 1250227.

It is a cyclic number.

It is not a de Polignac number, because 7220521 - 2¹ = 7220519 is a prime.

It is a super-2 number, since 2×7220521² = 104271847022882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7220531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5490 + ... + 6676.

It is an arithmetic number, because the mean of its divisors is an integer number (570240).

Almost surely, 2^7220521 is an apocalyptic number.

It is an amenable number.

7220521 is a deficient number, since it is larger than the sum of its proper divisors (1903319).

7220521 is a wasteful number, since it uses less digits than its factorization.

7220521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 7220521 is about 2687.1027148213. The cubic root of 7220521 is about 193.2811548315.

Adding to 7220521 its reverse (1250227), we get a palindrome (8470748).

The spelling of 7220521 in words is "seven million, two hundred twenty thousand, five hundred twenty-one".