22111221221 has 8 divisors (see below), whose sum is σ = 22944106944. Its totient is φ = 21292820640.

The previous prime is 22111221217. The next prime is 22111221259. The reversal of 22111221221 is 12212211122.

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 22111221221 - 2² = 22111221217 is a prime.

It is a super-2 number, since 2×22111221221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22111221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111221271) 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, 3618176 + ... + 3624281.

It is an arithmetic number, because the mean of its divisors is an integer number (2868013368).

Almost surely, 2^22111221221 is an apocalyptic number.

It is an amenable number.

22111221221 is a deficient number, since it is larger than the sum of its proper divisors (832885723).

22111221221 is an equidigital number, since it uses as much as digits as its factorization.

22111221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242571.

The product of its digits is 64, while the sum is 17.

Adding to 22111221221 its reverse (12212211122), we get a palindrome (34323432343).

It can be divided in two parts, 2211122 and 1221, that multiplied together give a palindrome (2699779962).

The spelling of 22111221221 in words is "twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".