7022521 has 16 divisors (see below), whose sum is σ = 8201088. Its totient is φ = 5948800.

The previous prime is 7022507. The next prime is 7022531. The reversal of 7022521 is 1252207.

7022521 = 794² + 795² + ... + 804².

It is a de Polignac number, because none of the positive numbers 2^k-7022521 is a prime.

It is a Duffinian number.

7022521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7022531) 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, 10035 + ... + 10711.

It is an arithmetic number, because the mean of its divisors is an integer number (512568).

Almost surely, 2^7022521 is an apocalyptic number.

It is an amenable number.

7022521 is a deficient number, since it is larger than the sum of its proper divisors (1178567).

7022521 is a wasteful number, since it uses less digits than its factorization.

7022521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

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

The square root of 7022521 is about 2650.0039622612. The cubic root of 7022521 is about 191.4980468684.

Adding to 7022521 its reverse (1252207), we get a palindrome (8274728).

It can be divided in two parts, 702 and 2521, that added together give a palindrome (3223).

The spelling of 7022521 in words is "seven million, twenty-two thousand, five hundred twenty-one".