6434366021 has 4 divisors (see below), whose sum is σ = 6435506700. Its totient is φ = 6433225344.

The previous prime is 6434365997. The next prime is 6434366047. The reversal of 6434366021 is 1206634346.

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 4645921921 + 1788444100 = 68161^2 + 42290^2 .

It is a cyclic number.

It is not a de Polignac number, because 6434366021 - 2²² = 6430171717 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 (6434366221) 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, 561836 + ... + 573173.

It is an arithmetic number, because the mean of its divisors is an integer number (1608876675).

Almost surely, 2^6434366021 is an apocalyptic number.

It is an amenable number.

6434366021 is a deficient number, since it is larger than the sum of its proper divisors (1140679).

6434366021 is a wasteful number, since it uses less digits than its factorization.

6434366021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140678.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 6434366021 is about 80214.5000670078. The cubic root of 6434366021 is about 1859.9527892014.

The spelling of 6434366021 in words is "six billion, four hundred thirty-four million, three hundred sixty-six thousand, twenty-one".