2151313220 has 96 divisors (see below), whose sum is σ = 5313724416. Its totient is φ = 716284800.

The previous prime is 2151313207. The next prime is 2151313267. The reversal of 2151313220 is 223131512.

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 = 2151313192 and 2151313201.

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 31 ways as a sum of consecutive naturals, for example, 1148885 + ... + 1150755.

It is an arithmetic number, because the mean of its divisors is an integer number (55351296).

Almost surely, 2^2151313220 is an apocalyptic number.

2151313220 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 2151313220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2656862208).

2151313220 is an abundant number, since it is smaller than the sum of its proper divisors (3162411196).

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

2151313220 is a wasteful number, since it uses less digits than its factorization.

2151313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2119 counting only the distinct ones).

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

The square root of 2151313220 is about 46382.2511312248. The cubic root of 2151313220 is about 1290.9256061529.

Adding to 2151313220 its reverse (223131512), we get a palindrome (2374444732).

The spelling of 2151313220 in words is "two billion, one hundred fifty-one million, three hundred thirteen thousand, two hundred twenty".