133502221 has 8 divisors (see below), whose sum is σ = 135961784. Its totient is φ = 131051520.

The previous prime is 133502209. The next prime is 133502233. The reversal of 133502221 is 122205331.

It is an interprime number because it is at equal distance from previous prime (133502209) and next prime (133502233).

It can be written as a sum of positive squares in 4 ways, for example, as 9424900 + 124077321 = 3070^2 + 11139^2 .

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 133502221 - 2⁷ = 133502093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133502321) 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, 33301 + ... + 37093.

It is an arithmetic number, because the mean of its divisors is an integer number (16995223).

Almost surely, 2^133502221 is an apocalyptic number.

It is an amenable number.

133502221 is a deficient number, since it is larger than the sum of its proper divisors (2459563).

133502221 is an equidigital number, since it uses as much as digits as its factorization.

133502221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 133502221 is about 11554.3161199614. The cubic root of 133502221 is about 511.0885642735.

Adding to 133502221 its reverse (122205331), we get a palindrome (255707552).

The spelling of 133502221 in words is "one hundred thirty-three million, five hundred two thousand, two hundred twenty-one".