2181357715 has 16 divisors (see below), whose sum is σ = 2641923072. Its totient is φ = 1728929664.

The previous prime is 2181357713. The next prime is 2181357767. The reversal of 2181357715 is 5177531812.

It is a cyclic number.

It is not a de Polignac number, because 2181357715 - 2¹ = 2181357713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181357713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554937 + ... + 558853.

It is an arithmetic number, because the mean of its divisors is an integer number (165120192).

Almost surely, 2^2181357715 is an apocalyptic number.

2181357715 is a deficient number, since it is larger than the sum of its proper divisors (460565357).

2181357715 is a wasteful number, since it uses less digits than its factorization.

2181357715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926.

The product of its digits is 58800, while the sum is 40.

The square root of 2181357715 is about 46705.0073867888. The cubic root of 2181357715 is about 1296.9073853934.

The spelling of 2181357715 in words is "two billion, one hundred eighty-one million, three hundred fifty-seven thousand, seven hundred fifteen".