2065667021 has 4 divisors (see below), whose sum is σ = 2253454944. Its totient is φ = 1877879100.

The previous prime is 2065667011. The next prime is 2065667027. The reversal of 2065667021 is 1207665602.

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-2065667021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065667027) 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, 93893945 + ... + 93893966.

It is an arithmetic number, because the mean of its divisors is an integer number (563363736).

Almost surely, 2^2065667021 is an apocalyptic number.

It is an amenable number.

2065667021 is a deficient number, since it is larger than the sum of its proper divisors (187787923).

2065667021 is a wasteful number, since it uses less digits than its factorization.

2065667021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187787922.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 2065667021 is about 45449.6096902933. The cubic root of 2065667021 is about 1273.5620381679.

The spelling of 2065667021 in words is "two billion, sixty-five million, six hundred sixty-seven thousand, twenty-one".