36556312221 has 96 divisors (see below), whose sum is σ = 62783779968. Its totient is φ = 20205918720.

The previous prime is 36556312201. The next prime is 36556312229. The reversal of 36556312221 is 12221365563.

36556312221 is a `hidden beast` number, since 3 + 65 + 563 + 12 + 2 + 21 = 666.

It is not a de Polignac number, because 36556312221 - 2¹¹ = 36556310173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36556312229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 45866995 + ... + 45867791.

It is an arithmetic number, because the mean of its divisors is an integer number (653997708).

Almost surely, 2^36556312221 is an apocalyptic number.

It is an amenable number.

36556312221 is a deficient number, since it is larger than the sum of its proper divisors (26227467747).

36556312221 is a wasteful number, since it uses less digits than its factorization.

36556312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1208 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

Adding to 36556312221 its reverse (12221365563), we get a palindrome (48777677784).

The spelling of 36556312221 in words is "thirty-six billion, five hundred fifty-six million, three hundred twelve thousand, two hundred twenty-one".