2111001011220 has 96 divisors (see below), whose sum is σ = 6227307233280. Its totient is φ = 532841846400.

The previous prime is 2111001011213. The next prime is 2111001011243. The reversal of 2111001011220 is 221101001112.

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 = 2111001011196 and 2111001011205.

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 31 ways as a sum of consecutive naturals, for example, 507729 + ... + 2116551.

It is an arithmetic number, because the mean of its divisors is an integer number (64867783680).

Almost surely, 2^{2111001011220} is an apocalyptic number.

2111001011220 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 2111001011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3113653616640).

2111001011220 is an abundant number, since it is smaller than the sum of its proper divisors (4116306222060).

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

2111001011220 is a wasteful number, since it uses less digits than its factorization.

2111001011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610005 (or 1610003 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2111001011220 its reverse (221101001112), we get a palindrome (2332102012332).

The spelling of 2111001011220 in words is "two trillion, one hundred eleven billion, one million, eleven thousand, two hundred twenty".