121212404101 has 4 divisors (see below), whose sum is σ = 121599664492. Its totient is φ = 120825143712.

The previous prime is 121212404099. The next prime is 121212404111. The reversal of 121212404101 is 101404212121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18123890625 + 103088513476 = 134625^2 + 321074^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212404101 - 2¹ = 121212404099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212404111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193629726 + ... + 193630351.

It is an arithmetic number, because the mean of its divisors is an integer number (30399916123).

Almost surely, 2^121212404101 is an apocalyptic number.

It is an amenable number.

121212404101 is a deficient number, since it is larger than the sum of its proper divisors (387260391).

121212404101 is an equidigital number, since it uses as much as digits as its factorization.

121212404101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387260390.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121212404101 its reverse (101404212121), we get a palindrome (222616616222).

The spelling of 121212404101 in words is "one hundred twenty-one billion, two hundred twelve million, four hundred four thousand, one hundred one".