22111211201221 has 8 divisors (see below), whose sum is σ = 23283634188320. Its totient is φ = 20939655717072.

The previous prime is 22111211201213. The next prime is 22111211201231. The reversal of 22111211201221 is 12210211211122.

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 22111211201221 - 2³ = 22111211201213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111211201231) 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, 216823410 + ... + 216925363.

It is an arithmetic number, because the mean of its divisors is an integer number (2910454273540).

Almost surely, 2^{22111211201221} is an apocalyptic number.

It is an amenable number.

22111211201221 is a deficient number, since it is larger than the sum of its proper divisors (1172422987099).

22111211201221 is a wasteful number, since it uses less digits than its factorization.

22111211201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433751475.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 22111211201221 its reverse (12210211211122), we get a palindrome (34321422412343).

Subtracting from 22111211201221 its reverse (12210211211122), we obtain a palindrome (9900999990099).

The spelling of 22111211201221 in words is "twenty-two trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, two hundred twenty-one".