210081381 has 16 divisors (see below), whose sum is σ = 285926400. Its totient is φ = 137169648.

The previous prime is 210081373. The next prime is 210081413. The reversal of 210081381 is 183180012.

It is not a de Polignac number, because 210081381 - 2³ = 210081373 is a prime.

It is a super-2 number, since 2×210081381² = 88268373285734322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210081341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33060 + ... + 38898.

It is an arithmetic number, because the mean of its divisors is an integer number (17870400).

Almost surely, 2^210081381 is an apocalyptic number.

It is an amenable number.

210081381 is a deficient number, since it is larger than the sum of its proper divisors (75845019).

210081381 is a wasteful number, since it uses less digits than its factorization.

210081381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6088.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 210081381 is about 14494.1843854699. The cubic root of 210081381 is about 594.4689666796.

The spelling of 210081381 in words is "two hundred ten million, eighty-one thousand, three hundred eighty-one".