22111212222221 has 8 divisors (see below), whose sum is σ = 22115249729664. Its totient is φ = 22107175102080.

The previous prime is 22111212222191. The next prime is 22111212222271. The reversal of 22111212222221 is 12222221211122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22111212222221 is a prime.

It is a super-3 number, since 3×22111212222221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111212222271) 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, 129396380 + ... + 129567146.

It is an arithmetic number, because the mean of its divisors is an integer number (2764406216208).

Almost surely, 2^{22111212222221} is an apocalyptic number.

It is an amenable number.

22111212222221 is a deficient number, since it is larger than the sum of its proper divisors (4037507443).

22111212222221 is a wasteful number, since it uses less digits than its factorization.

22111212222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193651.

The product of its digits is 512, while the sum is 23.

Adding to 22111212222221 its reverse (12222221211122), we get a palindrome (34333433433343).

The spelling of 22111212222221 in words is "twenty-two trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".