133221365 has 4 divisors (see below), whose sum is σ = 159865644. Its totient is φ = 106577088.

The previous prime is 133221343. The next prime is 133221371. The reversal of 133221365 is 563122331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66210769 + 67010596 = 8137^2 + 8186^2 .

It is a cyclic number.

It is not a de Polignac number, because 133221365 - 2⁶ = 133221301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13322132 + ... + 13322141.

It is an arithmetic number, because the mean of its divisors is an integer number (39966411).

Almost surely, 2^133221365 is an apocalyptic number.

It is an amenable number.

133221365 is a deficient number, since it is larger than the sum of its proper divisors (26644279).

133221365 is an equidigital number, since it uses as much as digits as its factorization.

133221365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26644278.

The product of its digits is 3240, while the sum is 26.

The square root of 133221365 is about 11542.1559944406. The cubic root of 133221365 is about 510.7299108973.

Adding to 133221365 its reverse (563122331), we get a palindrome (696343696).

The spelling of 133221365 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred sixty-five".