36531315221 has 2 divisors, whose sum is σ = 36531315222. Its totient is φ = 36531315220.

The previous prime is 36531315217. The next prime is 36531315241. The reversal of 36531315221 is 12251313563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35630715121 + 900600100 = 188761^2 + 30010^2 .

It is a cyclic number.

It is not a de Polignac number, because 36531315221 - 2² = 36531315217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36531315241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18265657610 + 18265657611.

It is an arithmetic number, because the mean of its divisors is an integer number (18265657611).

Almost surely, 2^36531315221 is an apocalyptic number.

It is an amenable number.

36531315221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36531315221 is an equidigital number, since it uses as much as digits as its factorization.

36531315221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

Adding to 36531315221 its reverse (12251313563), we get a palindrome (48782628784).

The spelling of 36531315221 in words is "thirty-six billion, five hundred thirty-one million, three hundred fifteen thousand, two hundred twenty-one".