20212111220 has 24 divisors (see below), whose sum is σ = 48509067264. Its totient is φ = 6929866656.

The previous prime is 20212111207. The next prime is 20212111229. The reversal of 20212111220 is 2211121202.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20212111195 and 20212111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212111229) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 72185972 + ... + 72186251.

It is an arithmetic number, because the mean of its divisors is an integer number (2021211136).

Almost surely, 2^20212111220 is an apocalyptic number.

20212111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212111220 is an abundant number, since it is smaller than the sum of its proper divisors (28296956044).

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

20212111220 is a wasteful number, since it uses less digits than its factorization.

20212111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144372239 (or 144372237 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20212111220 its reverse (2211121202), we get a palindrome (22423232422).

The spelling of 20212111220 in words is "twenty billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".