36212221 has 2 divisors, whose sum is σ = 36212222. Its totient is φ = 36212220.

The previous prime is 36212219. The next prime is 36212269. The reversal of 36212221 is 12221263.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32936121 + 3276100 = 5739^2 + 1810^2 .

It is an emirp because it is prime and its reverse (12221263) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36212221 - 2¹ = 36212219 is a prime.

It is a super-2 number, since 2×36212221² = 2622649899505682, which contains 22 as substring.

Together with 36212219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36212821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18106110 + 18106111.

It is an arithmetic number, because the mean of its divisors is an integer number (18106111).

Almost surely, 2^36212221 is an apocalyptic number.

It is an amenable number.

36212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

36212221 is an equidigital number, since it uses as much as digits as its factorization.

36212221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 36212221 is about 6017.6590963596. The cubic root of 36212221 is about 330.8402858500.

Adding to 36212221 its reverse (12221263), we get a palindrome (48433484).

The spelling of 36212221 in words is "thirty-six million, two hundred twelve thousand, two hundred twenty-one".