2152311521 has 4 divisors (see below), whose sum is σ = 2160686532. Its totient is φ = 2143936512.

The previous prime is 2152311509. The next prime is 2152311541. The reversal of 2152311521 is 1251132512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1002355600 + 1149955921 = 31660^2 + 33911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2152311521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152311541) 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, 4187120 + ... + 4187633.

It is an arithmetic number, because the mean of its divisors is an integer number (540171633).

Almost surely, 2^2152311521 is an apocalyptic number.

It is an amenable number.

2152311521 is a deficient number, since it is larger than the sum of its proper divisors (8375011).

2152311521 is an equidigital number, since it uses as much as digits as its factorization.

2152311521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8375010.

The product of its digits is 600, while the sum is 23.

The square root of 2152311521 is about 46393.0115534657. The cubic root of 2152311521 is about 1291.1252567695.

The spelling of 2152311521 in words is "two billion, one hundred fifty-two million, three hundred eleven thousand, five hundred twenty-one".