121212321 has 8 divisors (see below), whose sum is σ = 162646464. Its totient is φ = 80293200.

The previous prime is 121212317. The next prime is 121212341. The reversal of 121212321 is 123212121.

121212321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121212321 - 2² = 121212317 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121212321.

It is not an unprimeable number, because it can be changed into a prime (121212341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128205 + ... + 129146.

It is an arithmetic number, because the mean of its divisors is an integer number (20330808).

Almost surely, 2^121212321 is an apocalyptic number.

It is an amenable number.

121212321 is a deficient number, since it is larger than the sum of its proper divisors (41434143).

121212321 is a wasteful number, since it uses less digits than its factorization.

121212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257511.

The product of its digits is 48, while the sum is 15.

The square root of 121212321 is about 11009.6467245775. The cubic root of 121212321 is about 494.8978750648.

Adding to 121212321 its reverse (123212121), we get a palindrome (244424442).

The spelling of 121212321 in words is "one hundred twenty-one million, two hundred twelve thousand, three hundred twenty-one".