2206871721 has 24 divisors (see below), whose sum is σ = 3203016960. Its totient is φ = 1464202656.

The previous prime is 2206871713. The next prime is 2206871729. The reversal of 2206871721 is 1271786022.

It is an interprime number because it is at equal distance from previous prime (2206871713) and next prime (2206871729).

It is not a de Polignac number, because 2206871721 - 2³ = 2206871713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2206871729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3348490 + ... + 3349148.

It is an arithmetic number, because the mean of its divisors is an integer number (133459040).

Almost surely, 2^2206871721 is an apocalyptic number.

It is an amenable number.

2206871721 is a deficient number, since it is larger than the sum of its proper divisors (996145239).

2206871721 is a wasteful number, since it uses less digits than its factorization.

2206871721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885 (or 1882 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 2206871721 is about 46977.3532779360. The cubic root of 2206871721 is about 1301.9441760063.

The spelling of 2206871721 in words is "two billion, two hundred six million, eight hundred seventy-one thousand, seven hundred twenty-one".