22221012221 has 8 divisors (see below), whose sum is σ = 23395159200. Its totient is φ = 21047327280.

The previous prime is 22221012217. The next prime is 22221012271. The reversal of 22221012221 is 12221012222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22221012221 - 2² = 22221012217 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 22221012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221012211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14510 + ... + 211311.

It is an arithmetic number, because the mean of its divisors is an integer number (2924394900).

Almost surely, 2^22221012221 is an apocalyptic number.

It is an amenable number.

22221012221 is a deficient number, since it is larger than the sum of its proper divisors (1174146979).

22221012221 is a wasteful number, since it uses less digits than its factorization.

22221012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231019.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221012221 its reverse (12221012222), we get a palindrome (34442024443).

Subtracting from 22221012221 its reverse (12221012222), we obtain a palindrome (9999999999).

The spelling of 22221012221 in words is "twenty-two billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".