121212133 has 6 divisors (see below), whose sum is σ = 141001926. Its totient is φ = 103896072.

The previous prime is 121212131. The next prime is 121212163. The reversal of 121212133 is 331212121.

It can be written as a sum of positive squares in only one way, i.e., 71622369 + 49589764 = 8463^2 + 7042^2 .

It is not a de Polignac number, because 121212133 - 2¹ = 121212131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1236810 + ... + 1236907.

It is an arithmetic number, because the mean of its divisors is an integer number (23500321).

Almost surely, 2^121212133 is an apocalyptic number.

It is an amenable number.

121212133 is a deficient number, since it is larger than the sum of its proper divisors (19789793).

121212133 is an equidigital number, since it uses as much as digits as its factorization.

121212133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473731 (or 2473724 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 121212133 is about 11009.6381866072. The cubic root of 121212133 is about 494.8976192029.

Adding to 121212133 its reverse (331212121), we get a palindrome (452424254).

It can be divided in two parts, 1212121 and 33, that multiplied together give a palindrome (39999993).

The spelling of 121212133 in words is "one hundred twenty-one million, two hundred twelve thousand, one hundred thirty-three".