12121210321 has 8 divisors (see below), whose sum is σ = 13404278304. Its totient is φ = 10868332320.

The previous prime is 12121210291. The next prime is 12121210333. The reversal of 12121210321 is 12301212121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121210321 - 2¹⁵ = 12121177553 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121210295 and 12121210304.

It is not an unprimeable number, because it can be changed into a prime (12121210351) 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, 7546651 + ... + 7548256.

It is an arithmetic number, because the mean of its divisors is an integer number (1675534788).

Almost surely, 2^12121210321 is an apocalyptic number.

12121210321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121210321 is a deficient number, since it is larger than the sum of its proper divisors (1283067983).

12121210321 is a wasteful number, since it uses less digits than its factorization.

12121210321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15094991.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12121210321 its reverse (12301212121), we get a palindrome (24422422442).

The spelling of 12121210321 in words is "twelve billion, one hundred twenty-one million, two hundred ten thousand, three hundred twenty-one".