22111012221 has 32 divisors (see below), whose sum is σ = 30828349440. Its totient is φ = 14083977600.

The previous prime is 22111012201. The next prime is 22111012223. The reversal of 22111012221 is 12221011122.

It is not a de Polignac number, because 22111012221 - 2³⁴ = 4931143037 is a prime.

It is a super-2 number, since 2×22111012221² (a number of 21 digits) contains 22 as substring.

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 22111012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111012223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1961026 + ... + 1972268.

It is an arithmetic number, because the mean of its divisors is an integer number (963385920).

Almost surely, 2^22111012221 is an apocalyptic number.

It is an amenable number.

22111012221 is a deficient number, since it is larger than the sum of its proper divisors (8717337219).

22111012221 is a wasteful number, since it uses less digits than its factorization.

22111012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11617.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22111012221 its reverse (12221011122), we get a palindrome (34332023343).

The spelling of 22111012221 in words is "twenty-two billion, one hundred eleven million, twelve thousand, two hundred twenty-one".