101212121220121 has 4 divisors (see below), whose sum is σ = 101299902766132. Its totient is φ = 101124339674112.

The previous prime is 101212121220101. The next prime is 101212121220169. The reversal of 101212121220121 is 121022121212101.

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 85717970560000 + 15494150660121 = 9258400^2 + 3936261^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212121220121 - 2¹⁷ = 101212121089049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101212121220101) 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, 43890771276 + ... + 43890773581.

It is an arithmetic number, because the mean of its divisors is an integer number (25324975691533).

Almost surely, 2^{101212121220121} is an apocalyptic number.

It is an amenable number.

101212121220121 is a deficient number, since it is larger than the sum of its proper divisors (87781546011).

101212121220121 is an equidigital number, since it uses as much as digits as its factorization.

101212121220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87781546010.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 101212121220121 its reverse (121022121212101), we get a palindrome (222234242432222).

The spelling of 101212121220121 in words is "one hundred one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".