20121022220 has 48 divisors (see below), whose sum is σ = 45572079168. Its totient is φ = 7418261760.

The previous prime is 20121022213. The next prime is 20121022241. The reversal of 20121022220 is 2222012102.

It is a junction number, because it is equal to n+sod(n) for n = 20121022195 and 20121022204.

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 in 15 ways as a sum of consecutive naturals, for example, 118865 + ... + 233175.

It is an arithmetic number, because the mean of its divisors is an integer number (949418316).

Almost surely, 2^20121022220 is an apocalyptic number.

20121022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121022220 is an abundant number, since it is smaller than the sum of its proper divisors (25451056948).

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

20121022220 is a wasteful number, since it uses less digits than its factorization.

20121022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115010 (or 115008 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20121022220 its reverse (2222012102), we get a palindrome (22343034322).

The spelling of 20121022220 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty".