2186707388721 has 16 divisors (see below), whose sum is σ = 2930820030336. Its totient is φ = 1450200370176.

The previous prime is 2186707388717. The next prime is 2186707388741. The reversal of 2186707388721 is 1278837076812.

It is not a de Polignac number, because 2186707388721 - 2² = 2186707388717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2186707388741) 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, 23636671 + ... + 23729003.

It is an arithmetic number, because the mean of its divisors is an integer number (183176251896).

Almost surely, 2^{2186707388721} is an apocalyptic number.

It is an amenable number.

2186707388721 is a deficient number, since it is larger than the sum of its proper divisors (744112641615).

2186707388721 is a wasteful number, since it uses less digits than its factorization.

2186707388721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133432.

The product of its (nonzero) digits is 12644352, while the sum is 60.

The spelling of 2186707388721 in words is "two trillion, one hundred eighty-six billion, seven hundred seven million, three hundred eighty-eight thousand, seven hundred twenty-one".