4664647021 has 4 divisors (see below), whose sum is σ = 4680567612. Its totient is φ = 4648726432.

The previous prime is 4664647007. The next prime is 4664647067. The reversal of 4664647021 is 1207464664.

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 3935052900 + 729594121 = 62730^2 + 27011^2 .

It is a cyclic number.

It is not a de Polignac number, because 4664647021 - 2²³ = 4656258413 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 (4664647921) 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, 7959856 + ... + 7960441.

It is an arithmetic number, because the mean of its divisors is an integer number (1170141903).

Almost surely, 2^4664647021 is an apocalyptic number.

It is an amenable number.

4664647021 is a deficient number, since it is larger than the sum of its proper divisors (15920591).

4664647021 is a wasteful number, since it uses less digits than its factorization.

4664647021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15920590.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 4664647021 is about 68298.2212140258. The cubic root of 4664647021 is about 1670.8582034060.

The spelling of 4664647021 in words is "four billion, six hundred sixty-four million, six hundred forty-seven thousand, twenty-one".