20111221222 has 4 divisors (see below), whose sum is σ = 30166831836. Its totient is φ = 10055610610.

The previous prime is 20111221219. The next prime is 20111221237. The reversal of 20111221222 is 22212211102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20111221222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111221196 and 20111221205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5027805304 + ... + 5027805307.

It is an arithmetic number, because the mean of its divisors is an integer number (7541707959).

Almost surely, 2^20111221222 is an apocalyptic number.

20111221222 is a deficient number, since it is larger than the sum of its proper divisors (10055610614).

20111221222 is a wasteful number, since it uses less digits than its factorization.

20111221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055610613.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20111221222 its reverse (22212211102), we get a palindrome (42323432324).

The spelling of 20111221222 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-two".