121212100321 has 8 divisors (see below), whose sum is σ = 131412191400. Its totient is φ = 111137164032.

The previous prime is 121212100319. The next prime is 121212100357. The reversal of 121212100321 is 123001212121.

It can be written as a sum of positive squares in 4 ways, for example, as 7127580625 + 114084519696 = 84425^2 + 337764^2 .

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 121212100321 - 2¹ = 121212100319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212100295 and 121212100304.

It is not an unprimeable number, because it can be changed into a prime (121212100301) 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, 31286680 + ... + 31290553.

It is an arithmetic number, because the mean of its divisors is an integer number (16426523925).

Almost surely, 2^121212100321 is an apocalyptic number.

It is an amenable number.

121212100321 is a deficient number, since it is larger than the sum of its proper divisors (10200091079).

121212100321 is a wasteful number, since it uses less digits than its factorization.

121212100321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62577395.

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

Adding to 121212100321 its reverse (123001212121), we get a palindrome (244213312442).

The spelling of 121212100321 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred thousand, three hundred twenty-one".