2111312221020 has 144 divisors (see below), whose sum is σ = 6581033554368. Its totient is φ = 547497584640.

The previous prime is 2111312221003. The next prime is 2111312221033. The reversal of 2111312221020 is 201222131112.

2111312221020 is a `hidden beast` number, since 2 + 111 + 312 + 221 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2111312220984 and 2111312221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12107892 + ... + 12281028.

Almost surely, 2^{2111312221020} is an apocalyptic number.

2111312221020 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 2111312221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3290516777184).

2111312221020 is an abundant number, since it is smaller than the sum of its proper divisors (4469721333348).

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

2111312221020 is a wasteful number, since it uses less digits than its factorization.

2111312221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175020 (or 175015 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 2111312221020 its reverse (201222131112), we get a palindrome (2312534352132).

It can be divided in two parts, 2111312 and 221020, that added together give a palindrome (2332332).

The spelling of 2111312221020 in words is "two trillion, one hundred eleven billion, three hundred twelve million, two hundred twenty-one thousand, twenty".