133213121 has 2 divisors, whose sum is σ = 133213122. Its totient is φ = 133213120.

The previous prime is 133213117. The next prime is 133213159. The reversal of 133213121 is 121312331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113720896 + 19492225 = 10664^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 133213121 - 2² = 133213117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133213121.

It is not a weakly prime, because it can be changed into another prime (133263121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66606560 + 66606561.

It is an arithmetic number, because the mean of its divisors is an integer number (66606561).

Almost surely, 2^133213121 is an apocalyptic number.

It is an amenable number.

133213121 is a deficient number, since it is larger than the sum of its proper divisors (1).

133213121 is an equidigital number, since it uses as much as digits as its factorization.

133213121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 133213121 is about 11541.7988632622. The cubic root of 133213121 is about 510.7193756896.

Adding to 133213121 its reverse (121312331), we get a palindrome (254525452).

The spelling of 133213121 in words is "one hundred thirty-three million, two hundred thirteen thousand, one hundred twenty-one".