4636520040421 has 4 divisors (see below), whose sum is σ = 4636609440012. Its totient is φ = 4636430640832.

The previous prime is 4636520040419. The next prime is 4636520040463. The reversal of 4636520040421 is 1240400256364.

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 584697269025 + 4051822771396 = 764655^2 + 2012914^2 .

It is a cyclic number.

It is not a de Polignac number, because 4636520040421 - 2¹ = 4636520040419 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 (4636520040491) 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, 44621956 + ... + 44725741.

It is an arithmetic number, because the mean of its divisors is an integer number (1159152360003).

Almost surely, 2^{4636520040421} is an apocalyptic number.

It is an amenable number.

4636520040421 is a deficient number, since it is larger than the sum of its proper divisors (89399591).

4636520040421 is an equidigital number, since it uses as much as digits as its factorization.

4636520040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89399590.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 4636520040421 its reverse (1240400256364), we get a palindrome (5876920296785).

The spelling of 4636520040421 in words is "four trillion, six hundred thirty-six billion, five hundred twenty million, forty thousand, four hundred twenty-one".