2111221020 has 24 divisors (see below), whose sum is σ = 5911419024. Its totient is φ = 562992256.

The previous prime is 2111221019. The next prime is 2111221031. The reversal of 2111221020 is 201221112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2111220987 and 2111221005.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 17593449 + ... + 17593568.

It is an arithmetic number, because the mean of its divisors is an integer number (246309126).

Almost surely, 2^2111221020 is an apocalyptic number.

2111221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111221020 is an abundant number, since it is smaller than the sum of its proper divisors (3800198004).

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

2111221020 is a wasteful number, since it uses less digits than its factorization.

2111221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35187029 (or 35187027 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2111221020 is about 45948.0252023958. The cubic root of 2111221020 is about 1282.8559723805.

Adding to 2111221020 its reverse (201221112), we get a palindrome (2312442132).

The spelling of 2111221020 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, twenty".