2668464021 has 4 divisors (see below), whose sum is σ = 3557952032. Its totient is φ = 1778976012.

The previous prime is 2668464011. The next prime is 2668464047. The reversal of 2668464021 is 1204648662.

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 not a de Polignac number, because 2668464021 - 2⁶ = 2668463957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2668464011) by changing a digit.

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, 444744001 + ... + 444744006.

It is an arithmetic number, because the mean of its divisors is an integer number (889488008).

Almost surely, 2^2668464021 is an apocalyptic number.

It is an amenable number.

2668464021 is a deficient number, since it is larger than the sum of its proper divisors (889488011).

2668464021 is an equidigital number, since it uses as much as digits as its factorization.

2668464021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889488010.

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 2668464021 is about 51657.1778265131. The cubic root of 2668464021 is about 1387.0340327036.

The spelling of 2668464021 in words is "two billion, six hundred sixty-eight million, four hundred sixty-four thousand, twenty-one".