2181511053 has 12 divisors (see below), whose sum is σ = 3153907068. Its totient is φ = 1453032000.

The previous prime is 2181511039. The next prime is 2181511099. The reversal of 2181511053 is 3501151812.

2181511053 is a `hidden beast` number, since 21 + 81 + 511 + 0 + 53 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 144072009 + 2037439044 = 12003^2 + 45138^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2181511053 is a prime.

It is a super-2 number, since 2×2181511053² = 9517980948722337618, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181511753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98448 + ... + 118553.

It is an arithmetic number, because the mean of its divisors is an integer number (262825589).

Almost surely, 2^2181511053 is an apocalyptic number.

It is an amenable number.

2181511053 is a deficient number, since it is larger than the sum of its proper divisors (972396015).

2181511053 is a wasteful number, since it uses less digits than its factorization.

2181511053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218124 (or 218121 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 2181511053 is about 46706.6489164016. The cubic root of 2181511053 is about 1296.9377732758.

Adding to 2181511053 its reverse (3501151812), we get a palindrome (5682662865).

The spelling of 2181511053 in words is "two billion, one hundred eighty-one million, five hundred eleven thousand, fifty-three".