121212210005 has 4 divisors (see below), whose sum is σ = 145454652012. Its totient is φ = 96969768000.

The previous prime is 121212209999. The next prime is 121212210011. The reversal of 121212210005 is 500012212121.

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

It is an interprime number because it is at equal distance from previous prime (121212209999) and next prime (121212210011).

It can be written as a sum of positive squares in 2 ways, for example, as 47220593809 + 73991616196 = 217303^2 + 272014^2 .

It is not a de Polignac number, because 121212210005 - 2¹⁸ = 121211947861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12121220996 + ... + 12121221005.

It is an arithmetic number, because the mean of its divisors is an integer number (36363663003).

Almost surely, 2^121212210005 is an apocalyptic number.

It is an amenable number.

121212210005 is a deficient number, since it is larger than the sum of its proper divisors (24242442007).

121212210005 is an equidigital number, since it uses as much as digits as its factorization.

121212210005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24242442006.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 121212210005 its reverse (500012212121), we get a palindrome (621224422126).

The spelling of 121212210005 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, five".