22520221 has 4 divisors (see below), whose sum is σ = 22581952. Its totient is φ = 22458492.

The previous prime is 22520219. The next prime is 22520227. The reversal of 22520221 is 12202522.

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 22520221 - 2¹ = 22520219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22520195 and 22520204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22520227) 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, 30315 + ... + 31048.

It is an arithmetic number, because the mean of its divisors is an integer number (5645488).

Almost surely, 2^22520221 is an apocalyptic number.

It is an amenable number.

22520221 is a deficient number, since it is larger than the sum of its proper divisors (61731).

22520221 is an equidigital number, since it uses as much as digits as its factorization.

22520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61730.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22520221 is about 4745.5474921235. The cubic root of 22520221 is about 282.3953552952.

Adding to 22520221 its reverse (12202522), we get a palindrome (34722743).

The spelling of 22520221 in words is "twenty-two million, five hundred twenty thousand, two hundred twenty-one".