12121202121 has 8 divisors (see below), whose sum is σ = 18470403264. Its totient is φ = 6926401200.

The previous prime is 12121202087. The next prime is 12121202161. The reversal of 12121202121 is 12120212121.

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

It is not a de Polignac number, because 12121202121 - 2²³ = 12112813513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121202121.

It is not an unprimeable number, because it can be changed into a prime (12121202161) 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, 288600030 + ... + 288600071.

It is an arithmetic number, because the mean of its divisors is an integer number (2308800408).

Almost surely, 2^12121202121 is an apocalyptic number.

It is an amenable number.

12121202121 is a deficient number, since it is larger than the sum of its proper divisors (6349201143).

12121202121 is an equidigital number, since it uses as much as digits as its factorization.

12121202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577200111.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12121202121 its reverse (12120212121), we get a palindrome (24241414242).

The spelling of 12121202121 in words is "twelve billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-one".