22280521 has 4 divisors (see below), whose sum is σ = 23453200. Its totient is φ = 21107844.

The previous prime is 22280513. The next prime is 22280551. The reversal of 22280521 is 12508222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22280521 - 2³ = 22280513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22280492 and 22280501.

It is not an unprimeable number, because it can be changed into a prime (22280501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586311 + ... + 586348.

It is an arithmetic number, because the mean of its divisors is an integer number (5863300).

Almost surely, 2^22280521 is an apocalyptic number.

It is an amenable number.

22280521 is a deficient number, since it is larger than the sum of its proper divisors (1172679).

22280521 is a wasteful number, since it uses less digits than its factorization.

22280521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172678.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 22280521 is about 4720.2246768560. The cubic root of 22280521 is about 281.3898625516.

Adding to 22280521 its reverse (12508222), we get a palindrome (34788743).

It can be divided in two parts, 22280 and 521, that added together give a square (22801 = 151²).

The spelling of 22280521 in words is "twenty-two million, two hundred eighty thousand, five hundred twenty-one".