133212261 has 32 divisors (see below), whose sum is σ = 221276160. Its totient is φ = 69407424.

The previous prime is 133212229. The next prime is 133212271. The reversal of 133212261 is 162212331.

It is not a de Polignac number, because 133212261 - 2⁵ = 133212229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133212271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19720 + ... + 25598.

It is an arithmetic number, because the mean of its divisors is an integer number (6914880).

Almost surely, 2^133212261 is an apocalyptic number.

It is an amenable number.

133212261 is a deficient number, since it is larger than the sum of its proper divisors (88063899).

133212261 is a wasteful number, since it uses less digits than its factorization.

133212261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985.

The product of its digits is 432, while the sum is 21.

The square root of 133212261 is about 11541.7616073111. The cubic root of 133212261 is about 510.7182766497.

Adding to 133212261 its reverse (162212331), we get a palindrome (295424592).

The spelling of 133212261 in words is "one hundred thirty-three million, two hundred twelve thousand, two hundred sixty-one".