2171885387 has 8 divisors (see below), whose sum is σ = 2507744736. Its totient is φ = 1842423552.

The previous prime is 2171885381. The next prime is 2171885393. The reversal of 2171885387 is 7835881712.

It is an interprime number because it is at equal distance from previous prime (2171885381) and next prime (2171885393).

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 2171885387 - 2¹⁴ = 2171869003 is a prime.

It is a super-2 number, since 2×2171885387² = 9434172268528279538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2171885381) 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, 1598648 + ... + 1600005.

It is an arithmetic number, because the mean of its divisors is an integer number (313468092).

Almost surely, 2^2171885387 is an apocalyptic number.

2171885387 is a deficient number, since it is larger than the sum of its proper divisors (335859349).

2171885387 is an equidigital number, since it uses as much as digits as its factorization.

2171885387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198757.

The product of its digits is 752640, while the sum is 50.

The square root of 2171885387 is about 46603.4911460504. The cubic root of 2171885387 is about 1295.0274313296.

The spelling of 2171885387 in words is "two billion, one hundred seventy-one million, eight hundred eighty-five thousand, three hundred eighty-seven".