121432121 has 4 divisors (see below), whose sum is σ = 122205732. Its totient is φ = 120658512.

The previous prime is 121432117. The next prime is 121432123. The reversal of 121432121 is 121234121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49843600 + 71588521 = 7060^2 + 8461^2 .

It is a cyclic number.

It is not a de Polignac number, because 121432121 - 2² = 121432117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121432121.

It is not an unprimeable number, because it can be changed into a prime (121432123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386570 + ... + 386883.

It is an arithmetic number, because the mean of its divisors is an integer number (30551433).

Almost surely, 2^121432121 is an apocalyptic number.

It is an amenable number.

121432121 is a deficient number, since it is larger than the sum of its proper divisors (773611).

121432121 is an equidigital number, since it uses as much as digits as its factorization.

121432121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773610.

The product of its digits is 96, while the sum is 17.

The square root of 121432121 is about 11019.6243583890. The cubic root of 121432121 is about 495.1968349591.

Adding to 121432121 its reverse (121234121), we get a palindrome (242666242).

The spelling of 121432121 in words is "one hundred twenty-one million, four hundred thirty-two thousand, one hundred twenty-one".