2121640264 has 16 divisors (see below), whose sum is σ = 3981883500. Its totient is φ = 1059804672.

The previous prime is 2121640259. The next prime is 2121640277. The reversal of 2121640264 is 4620461212.

It can be written as a sum of positive squares in 2 ways, for example, as 1967632164 + 154008100 = 44358^2 + 12410^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118017 + ... + 134800.

Almost surely, 2^2121640264 is an apocalyptic number.

It is an amenable number.

2121640264 is a deficient number, since it is larger than the sum of its proper divisors (1860243236).

2121640264 is a wasteful number, since it uses less digits than its factorization.

2121640264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253872 (or 253868 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 2121640264 is about 46061.2664176746. The cubic root of 2121640264 is about 1284.9628828474.

The spelling of 2121640264 in words is "two billion, one hundred twenty-one million, six hundred forty thousand, two hundred sixty-four".