1365224221 has 4 divisors (see below), whose sum is σ = 1409263744. Its totient is φ = 1321184700.

The previous prime is 1365224209. The next prime is 1365224249. The reversal of 1365224221 is 1224225631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1224225631 = 8243 ⋅148517.

It is a cyclic number.

It is not a de Polignac number, because 1365224221 - 2²⁷ = 1231006493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1365224221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365224291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22019715 + ... + 22019776.

It is an arithmetic number, because the mean of its divisors is an integer number (352315936).

Almost surely, 2^1365224221 is an apocalyptic number.

It is an amenable number.

1365224221 is a deficient number, since it is larger than the sum of its proper divisors (44039523).

1365224221 is an equidigital number, since it uses as much as digits as its factorization.

1365224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44039522.

The product of its digits is 5760, while the sum is 28.

The square root of 1365224221 is about 36948.9407290656. The cubic root of 1365224221 is about 1109.3484857259.

Adding to 1365224221 its reverse (1224225631), we get a palindrome (2589449852).

It can be divided in two parts, 13652 and 24221, that added together give a palindrome (37873).

The spelling of 1365224221 in words is "one billion, three hundred sixty-five million, two hundred twenty-four thousand, two hundred twenty-one".