2111221210020 has 384 divisors, whose sum is σ = 6668986867200. Its totient is φ = 495451471872.

The previous prime is 2111221210019. The next prime is 2111221210027. The reversal of 2111221210020 is 200121221112.

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

It is not an unprimeable number, because it can be changed into a prime (2111221210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 748924171 + ... + 748926989.

It is an arithmetic number, because the mean of its divisors is an integer number (17367153300).

Almost surely, 2^{2111221210020} is an apocalyptic number.

2111221210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2111221210020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3334493433600).

2111221210020 is an abundant number, since it is smaller than the sum of its proper divisors (4557765657180).

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

2111221210020 is a wasteful number, since it uses less digits than its factorization.

2111221210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279 (or 3277 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2111221210020 its reverse (200121221112), we get a palindrome (2311342431132).

The spelling of 2111221210020 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred ten thousand, twenty".