6436036021 has 4 divisors (see below), whose sum is σ = 6524200972. Its totient is φ = 6347871072.

The previous prime is 6436035997. The next prime is 6436036027. The reversal of 6436036021 is 1206306346.

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 3085247025 + 3350788996 = 55545^2 + 57886^2 .

It is a cyclic number.

It is not a de Polignac number, because 6436036021 - 2⁵ = 6436035989 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 (6436036027) 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, 44082366 + ... + 44082511.

It is an arithmetic number, because the mean of its divisors is an integer number (1631050243).

Almost surely, 2^6436036021 is an apocalyptic number.

It is an amenable number.

6436036021 is a deficient number, since it is larger than the sum of its proper divisors (88164951).

6436036021 is an equidigital number, since it uses as much as digits as its factorization.

6436036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88164950.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 6436036021 is about 80224.9089809393. The cubic root of 6436036021 is about 1860.1136883721.

The spelling of 6436036021 in words is "six billion, four hundred thirty-six million, thirty-six thousand, twenty-one".