133215321 has 16 divisors (see below), whose sum is σ = 179838144. Its totient is φ = 87706944.

The previous prime is 133215319. The next prime is 133215337. The reversal of 133215321 is 123512331.

It is not a de Polignac number, because 133215321 - 2¹ = 133215319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133215311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196435 + ... + 197111.

It is an arithmetic number, because the mean of its divisors is an integer number (11239884).

Almost surely, 2^133215321 is an apocalyptic number.

It is an amenable number.

133215321 is a deficient number, since it is larger than the sum of its proper divisors (46622823).

133215321 is a wasteful number, since it uses less digits than its factorization.

133215321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its digits is 540, while the sum is 21.

The square root of 133215321 is about 11541.8941686363. The cubic root of 133215321 is about 510.7221871655.

Adding to 133215321 its reverse (123512331), we get a palindrome (256727652).

It can be divided in two parts, 1332 and 15321, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 133215321 in words is "one hundred thirty-three million, two hundred fifteen thousand, three hundred twenty-one".