2101231320 has 64 divisors (see below), whose sum is σ = 6379672320. Its totient is φ = 553574784.

The previous prime is 2101231277. The next prime is 2101231333. The reversal of 2101231320 is 231321012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2101231320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95524 + ... + 115443.

It is an arithmetic number, because the mean of its divisors is an integer number (99682380).

Almost surely, 2^2101231320 is an apocalyptic number.

2101231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101231320 is an abundant number, since it is smaller than the sum of its proper divisors (4278441000).

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

2101231320 is a wasteful number, since it uses less digits than its factorization.

2101231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211064 (or 211060 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2101231320 is about 45839.1897834157. The cubic root of 2101231320 is about 1280.8294022344.

Adding to 2101231320 its reverse (231321012), we get a palindrome (2332552332).

The spelling of 2101231320 in words is "two billion, one hundred one million, two hundred thirty-one thousand, three hundred twenty".