20011221222 has 16 divisors (see below), whose sum is σ = 40026996912. Its totient is φ = 6669648000.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221222 is 22212211002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131263 + ... + 239274.

It is an arithmetic number, because the mean of its divisors is an integer number (2501687307).

Almost surely, 2^20011221222 is an apocalyptic number.

20011221222 is an abundant number, since it is smaller than the sum of its proper divisors (20015775690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20011221222 is a wasteful number, since it uses less digits than its factorization.

20011221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379543.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20011221222 its reverse (22212211002), we get a palindrome (42223432224).

The spelling of 20011221222 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred twenty-two".