2011321312220 has 96 divisors (see below), whose sum is σ = 4657834915776. Its totient is φ = 723448627200.

The previous prime is 2011321312199. The next prime is 2011321312229. The reversal of 2011321312220 is 222131231102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2011321312192 and 2011321312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011321312229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39944660 + ... + 39994980.

It is an arithmetic number, because the mean of its divisors is an integer number (48519113706).

Almost surely, 2^{2011321312220} is an apocalyptic number.

2011321312220 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 2011321312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2328917457888).

2011321312220 is an abundant number, since it is smaller than the sum of its proper divisors (2646513603556).

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

2011321312220 is a wasteful number, since it uses less digits than its factorization.

2011321312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52311 (or 52309 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 2011321312220 its reverse (222131231102), we get a palindrome (2233452543322).

The spelling of 2011321312220 in words is "two trillion, eleven billion, three hundred twenty-one million, three hundred twelve thousand, two hundred twenty".