2171396813 has 8 divisors (see below), whose sum is σ = 2215236600. Its totient is φ = 2127989248.

The previous prime is 2171396807. The next prime is 2171396819. The reversal of 2171396813 is 3186931712.

It is an interprime number because it is at equal distance from previous prime (2171396807) and next prime (2171396819).

It can be written as a sum of positive squares in 4 ways, for example, as 449312809 + 1722084004 = 21197^2 + 41498^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2171396813 - 2⁴ = 2171396797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171396819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97898 + ... + 118011.

It is an arithmetic number, because the mean of its divisors is an integer number (276904575).

Almost surely, 2^2171396813 is an apocalyptic number.

It is an amenable number.

2171396813 is a deficient number, since it is larger than the sum of its proper divisors (43839787).

2171396813 is a wasteful number, since it uses less digits than its factorization.

2171396813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216111.

The product of its digits is 54432, while the sum is 41.

The square root of 2171396813 is about 46598.2490336279. The cubic root of 2171396813 is about 1294.9303169076.

The spelling of 2171396813 in words is "two billion, one hundred seventy-one million, three hundred ninety-six thousand, eight hundred thirteen".