22205016721 has 4 divisors (see below), whose sum is σ = 22210438000. Its totient is φ = 22199595444.

The previous prime is 22205016697. The next prime is 22205016731. The reversal of 22205016721 is 12761050222.

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 22205016721 - 2⁹ = 22205016209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22205016721.

It is not an unprimeable number, because it can be changed into a prime (22205016731) 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, 2704491 + ... + 2712688.

It is an arithmetic number, because the mean of its divisors is an integer number (5552609500).

Almost surely, 2^22205016721 is an apocalyptic number.

It is an amenable number.

22205016721 is a deficient number, since it is larger than the sum of its proper divisors (5421279).

22205016721 is an equidigital number, since it uses as much as digits as its factorization.

22205016721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5421278.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 22205016721 its reverse (12761050222), we get a palindrome (34966066943).

It can be divided in two parts, 2220501 and 6721, that added together give a palindrome (2227222).

The spelling of 22205016721 in words is "twenty-two billion, two hundred five million, sixteen thousand, seven hundred twenty-one".