133231221218 has 32 divisors (see below), whose sum is σ = 209572392960. Its totient is φ = 63442612800.

The previous prime is 133231221217. The next prime is 133231221283. The reversal of 133231221218 is 812122132331.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (133231221217) 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, 1222043 + ... + 1326593.

It is an arithmetic number, because the mean of its divisors is an integer number (6549137280).

Almost surely, 2^133231221218 is an apocalyptic number.

133231221218 is a deficient number, since it is larger than the sum of its proper divisors (76341171742).

133231221218 is a wasteful number, since it uses less digits than its factorization.

133231221218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104882.

The product of its digits is 3456, while the sum is 29.

Adding to 133231221218 its reverse (812122132331), we get a palindrome (945353353549).

The spelling of 133231221218 in words is "one hundred thirty-three billion, two hundred thirty-one million, two hundred twenty-one thousand, two hundred eighteen".