2157199360 has 120 divisors (see below), whose sum is σ = 5485195800. Its totient is φ = 811597824.

The previous prime is 2157199357. The next prime is 2157199367. The reversal of 2157199360 is 639917512.

It can be written as a sum of positive squares in 4 ways, for example, as 307511296 + 1849688064 = 17536^2 + 43008^2 .

It is not an unprimeable number, because it can be changed into a prime (2157199367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1391866 + ... + 1393414.

It is an arithmetic number, because the mean of its divisors is an integer number (45709965).

Almost surely, 2^2157199360 is an apocalyptic number.

2157199360 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 2157199360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2742597900).

2157199360 is an abundant number, since it is smaller than the sum of its proper divisors (3327996440).

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

2157199360 is an equidigital number, since it uses as much as digits as its factorization.

2157199360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 2157199360 is about 46445.6602924321. The cubic root of 2157199360 is about 1292.1018875708.

The spelling of 2157199360 in words is "two billion, one hundred fifty-seven million, one hundred ninety-nine thousand, three hundred sixty".