133221315 has 16 divisors (see below), whose sum is σ = 214115328. Its totient is φ = 70730976.

The previous prime is 133221307. The next prime is 133221317. The reversal of 133221315 is 513122331.

It is not a de Polignac number, because 133221315 - 2³ = 133221307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133221291 and 133221300.

It is not an unprimeable number, because it can be changed into a prime (133221317) 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, 16569 + ... + 23258.

It is an arithmetic number, because the mean of its divisors is an integer number (13382208).

Almost surely, 2^133221315 is an apocalyptic number.

133221315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133221315 is a deficient number, since it is larger than the sum of its proper divisors (80894013).

133221315 is a wasteful number, since it uses less digits than its factorization.

133221315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40058.

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

The square root of 133221315 is about 11542.1538284672. The cubic root of 133221315 is about 510.7298470024.

Adding to 133221315 its reverse (513122331), we get a palindrome (646343646).

The spelling of 133221315 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred fifteen".