2181251075 has 12 divisors (see below), whose sum is σ = 2707000848. Its totient is φ = 1743549600.

The previous prime is 2181251057. The next prime is 2181251089. The reversal of 2181251075 is 5701521812.

It is not a de Polignac number, because 2181251075 - 2¹² = 2181246979 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5096 + ... + 66245.

It is an arithmetic number, because the mean of its divisors is an integer number (225583404).

Almost surely, 2^2181251075 is an apocalyptic number.

2181251075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2181251075 is a deficient number, since it is larger than the sum of its proper divisors (525749773).

2181251075 is a wasteful number, since it uses less digits than its factorization.

2181251075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72574 (or 72569 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 32.

The square root of 2181251075 is about 46703.8657393582. The cubic root of 2181251075 is about 1296.8862510854.

Adding to 2181251075 its reverse (5701521812), we get a palindrome (7882772887).

The spelling of 2181251075 in words is "two billion, one hundred eighty-one million, two hundred fifty-one thousand, seventy-five".