36556204221 has 6 divisors (see below), whose sum is σ = 52803406110. Its totient is φ = 24370802808.

The previous prime is 36556204211. The next prime is 36556204229. The reversal of 36556204221 is 12240265563.

36556204221 is a `hidden beast` number, since 3 + 6 + 5 + 5 + 620 + 4 + 2 + 21 = 666.

36556204221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 35556759225 + 999444996 = 188565^2 + 31614^2 .

It is not a de Polignac number, because 36556204221 - 2⁵ = 36556204189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36556204229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2030900226 + ... + 2030900243.

It is an arithmetic number, because the mean of its divisors is an integer number (8800567685).

Almost surely, 2^36556204221 is an apocalyptic number.

It is an amenable number.

36556204221 is a deficient number, since it is larger than the sum of its proper divisors (16247201889).

36556204221 is a wasteful number, since it uses less digits than its factorization.

36556204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061800475 (or 4061800472 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 36556204221 its reverse (12240265563), we get a palindrome (48796469784).

The spelling of 36556204221 in words is "thirty-six billion, five hundred fifty-six million, two hundred four thousand, two hundred twenty-one".