1365135221 has 8 divisors (see below), whose sum is σ = 1399215384. Its totient is φ = 1331092480.

The previous prime is 1365135179. The next prime is 1365135227. The reversal of 1365135221 is 1225315631.

It can be written as a sum of positive squares in 4 ways, for example, as 4558225 + 1360576996 = 2135^2 + 36886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1365135221 - 2⁶ = 1365135157 is a prime.

It is a super-2 number, since 2×1365135221² = 3727188343229437682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365135227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73541 + ... + 90213.

It is an arithmetic number, because the mean of its divisors is an integer number (174901923).

Almost surely, 2^1365135221 is an apocalyptic number.

It is an amenable number.

1365135221 is a deficient number, since it is larger than the sum of its proper divisors (34080163).

1365135221 is a wasteful number, since it uses less digits than its factorization.

1365135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18711.

The product of its digits is 5400, while the sum is 29.

The square root of 1365135221 is about 36947.7363447343. The cubic root of 1365135221 is about 1109.3243787796.

The spelling of 1365135221 in words is "one billion, three hundred sixty-five million, one hundred thirty-five thousand, two hundred twenty-one".