36445221 has 10 divisors (see below), whose sum is σ = 54442982. Its totient is φ = 24296760.

The previous prime is 36445219. The next prime is 36445231. The reversal of 36445221 is 12254463.

It can be written as a sum of positive squares in only one way, i.e., 30140100 + 6305121 = 5490^2 + 2511^2 .

It is not a de Polignac number, because 36445221 - 2¹ = 36445219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36445231) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 224890 + ... + 225051.

Almost surely, 2^36445221 is an apocalyptic number.

It is an amenable number.

36445221 is a deficient number, since it is larger than the sum of its proper divisors (17997761).

36445221 is an equidigital number, since it uses as much as digits as its factorization.

36445221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449953 (or 449944 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 36445221 is about 6036.9877422436. The cubic root of 36445221 is about 331.5483437204.

Adding to 36445221 its reverse (12254463), we get a palindrome (48699684).

The spelling of 36445221 in words is "thirty-six million, four hundred forty-five thousand, two hundred twenty-one".