22121222220 has 36 divisors (see below), whose sum is σ = 67101041280. Its totient is φ = 5898992544.

The previous prime is 22121222191. The next prime is 22121222231. The reversal of 22121222220 is 2222212122.

22121222220 is a `hidden beast` number, since 221 + 2 + 1 + 222 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22121222193 and 22121222202.

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 11 ways as a sum of consecutive naturals, for example, 61447660 + ... + 61448019.

Almost surely, 2^22121222220 is an apocalyptic number.

22121222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121222220 is an abundant number, since it is smaller than the sum of its proper divisors (44979819060).

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

22121222220 is a wasteful number, since it uses less digits than its factorization.

22121222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122895694 (or 122895689 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22121222220 its reverse (2222212122), we get a palindrome (24343434342).

The spelling of 22121222220 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".