2187108421 has 8 divisors (see below), whose sum is σ = 2193221880. Its totient is φ = 2181004992.

The previous prime is 2187108401. The next prime is 2187108431. The reversal of 2187108421 is 1248017812.

It can be written as a sum of positive squares in 4 ways, for example, as 393585921 + 1793522500 = 19839^2 + 42350^2 .

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 2187108421 - 2⁵ = 2187108389 is a prime.

It is a super-2 number, since 2×2187108421² = 9566886490418226482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187108401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639111 + ... + 642523.

It is an arithmetic number, because the mean of its divisors is an integer number (274152735).

Almost surely, 2^2187108421 is an apocalyptic number.

It is an amenable number.

2187108421 is a deficient number, since it is larger than the sum of its proper divisors (6113459).

2187108421 is an equidigital number, since it uses as much as digits as its factorization.

2187108421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 2187108421 is about 46766.5309917253. The cubic root of 2187108421 is about 1298.0460628729.

The spelling of 2187108421 in words is "two billion, one hundred eighty-seven million, one hundred eight thousand, four hundred twenty-one".