2151231320 has 96 divisors (see below), whose sum is σ = 5686789680. Its totient is φ = 730195200.

The previous prime is 2151231301. The next prime is 2151231347. The reversal of 2151231320 is 231321512.

It is a super-3 number, since 3×2151231320³ (a number of 29 digits) contains 333 as substring.

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 = 2151231292 and 2151231301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192527 + ... + 203393.

Almost surely, 2^2151231320 is an apocalyptic number.

2151231320 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 2151231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2843394840).

2151231320 is an abundant number, since it is smaller than the sum of its proper divisors (3535558360).

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

2151231320 is a wasteful number, since it uses less digits than its factorization.

2151231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10993 (or 10982 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2151231320 is about 46381.3682419999. The cubic root of 2151231320 is about 1290.9092241979.

Adding to 2151231320 its reverse (231321512), we get a palindrome (2382552832).

The spelling of 2151231320 in words is "two billion, one hundred fifty-one million, two hundred thirty-one thousand, three hundred twenty".