2145121568 has 24 divisors (see below), whose sum is σ = 4229015868. Its totient is φ = 1071085824.

The previous prime is 2145121549. The next prime is 2145121577. The reversal of 2145121568 is 8651215412.

It can be written as a sum of positive squares in 2 ways, for example, as 2040509584 + 104611984 = 45172^2 + 10228^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22271 + ... + 69182.

Almost surely, 2^2145121568 is an apocalyptic number.

It is an amenable number.

2145121568 is a deficient number, since it is larger than the sum of its proper divisors (2083894300).

2145121568 is an equidigital number, since it uses as much as digits as its factorization.

2145121568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92196 (or 92188 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The square root of 2145121568 is about 46315.4571174678. The cubic root of 2145121568 is about 1289.6859536390.

The spelling of 2145121568 in words is "two billion, one hundred forty-five million, one hundred twenty-one thousand, five hundred sixty-eight".