22401644221 has 4 divisors (see below), whose sum is σ = 24438157344. Its totient is φ = 20365131100.

The previous prime is 22401644219. The next prime is 22401644261. The reversal of 22401644221 is 12244610422.

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 22401644221 - 2¹ = 22401644219 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 22401644221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401644261) 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, 1018256545 + ... + 1018256566.

It is an arithmetic number, because the mean of its divisors is an integer number (6109539336).

Almost surely, 2^22401644221 is an apocalyptic number.

It is an amenable number.

22401644221 is a deficient number, since it is larger than the sum of its proper divisors (2036513123).

22401644221 is a wasteful number, since it uses less digits than its factorization.

22401644221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036513122.

The product of its (nonzero) digits is 6144, while the sum is 28.

It can be divided in two parts, 2240 and 1644221, that added together give a palindrome (1646461).

The spelling of 22401644221 in words is "twenty-two billion, four hundred one million, six hundred forty-four thousand, two hundred twenty-one".