2021111111220 has 96 divisors (see below), whose sum is σ = 6095648563200. Its totient is φ = 498899786880.

The previous prime is 2021111111191. The next prime is 2021111111281. The reversal of 2021111111220 is 221111111202.

It is a happy number.

It is a super-3 number, since 3×2021111111220³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2021111111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23579370 + ... + 23664929.

It is an arithmetic number, because the mean of its divisors is an integer number (63496339200).

Almost surely, 2^{2021111111220} is an apocalyptic number.

2021111111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021111111220 is an abundant number, since it is smaller than the sum of its proper divisors (4074537451980).

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

2021111111220 is a wasteful number, since it uses less digits than its factorization.

2021111111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47244365 (or 47244363 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2021111111220 its reverse (221111111202), we get a palindrome (2242222222422).

The spelling of 2021111111220 in words is "two trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty".