36211221 has 6 divisors (see below), whose sum is σ = 52305110. Its totient is φ = 24140808.

The previous prime is 36211211. The next prime is 36211277. The reversal of 36211221 is 12211263.

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 12152196 = 4905^2 + 3486^2 .

It is not a de Polignac number, because 36211221 - 2¹⁵ = 36178453 is a prime.

It is a super-2 number, since 2×36211221² = 2622505052621682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 36211194 and 36211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36211211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2011726 + ... + 2011743.

Almost surely, 2^36211221 is an apocalyptic number.

It is an amenable number.

36211221 is a deficient number, since it is larger than the sum of its proper divisors (16093889).

36211221 is a wasteful number, since it uses less digits than its factorization.

36211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023475 (or 4023472 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 36211221 is about 6017.5760069982. The cubic root of 36211221 is about 330.8372404386.

Adding to 36211221 its reverse (12211263), we get a palindrome (48422484).

The spelling of 36211221 in words is "thirty-six million, two hundred eleven thousand, two hundred twenty-one".