2115144521 has 4 divisors (see below), whose sum is σ = 2417308032. Its totient is φ = 1812981012.

The previous prime is 2115144491. The next prime is 2115144571. The reversal of 2115144521 is 1254415112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115144521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2115144571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151081745 + ... + 151081758.

It is an arithmetic number, because the mean of its divisors is an integer number (604327008).

Almost surely, 2^2115144521 is an apocalyptic number.

It is an amenable number.

2115144521 is a deficient number, since it is larger than the sum of its proper divisors (302163511).

2115144521 is an equidigital number, since it uses as much as digits as its factorization.

2115144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302163510.

The product of its digits is 1600, while the sum is 26.

The square root of 2115144521 is about 45990.7003751845. The cubic root of 2115144521 is about 1283.6501687087.

Adding to 2115144521 its reverse (1254415112), we get a palindrome (3369559633).

The spelling of 2115144521 in words is "two billion, one hundred fifteen million, one hundred forty-four thousand, five hundred twenty-one".