36506002221 has 24 divisors (see below), whose sum is σ = 56874197016. Its totient is φ = 22430782080.

The previous prime is 36506002219. The next prime is 36506002229. The reversal of 36506002221 is 12220060563.

36506002221 is a `hidden beast` number, since 3 + 6 + 50 + 600 + 2 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3739934025 + 32766068196 = 61155^2 + 181014^2 .

It is not a de Polignac number, because 36506002221 - 2¹ = 36506002219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36506002229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162510 + ... + 315311.

It is an arithmetic number, because the mean of its divisors is an integer number (2369758209).

Almost surely, 2^36506002221 is an apocalyptic number.

It is an amenable number.

36506002221 is a deficient number, since it is larger than the sum of its proper divisors (20368194795).

36506002221 is a wasteful number, since it uses less digits than its factorization.

36506002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478493 (or 478490 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 36506002221 its reverse (12220060563), we get a palindrome (48726062784).

The spelling of 36506002221 in words is "thirty-six billion, five hundred six million, two thousand, two hundred twenty-one".