36900221 has 2 divisors, whose sum is σ = 36900222. Its totient is φ = 36900220.

The previous prime is 36900187. The next prime is 36900239. The reversal of 36900221 is 12200963.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24552025 + 12348196 = 4955^2 + 3514^2 .

It is an emirp because it is prime and its reverse (12200963) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36900221 - 2²² = 32705917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36900271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18450110 + 18450111.

It is an arithmetic number, because the mean of its divisors is an integer number (18450111).

Almost surely, 2^36900221 is an apocalyptic number.

It is an amenable number.

36900221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36900221 is an equidigital number, since it uses as much as digits as its factorization.

36900221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 36900221 is about 6074.5552100545. Note that the first 3 decimals coincide. The cubic root of 36900221 is about 332.9223787795.

The spelling of 36900221 in words is "thirty-six million, nine hundred thousand, two hundred twenty-one".