121220010001 has 4 divisors (see below), whose sum is σ = 121607294692. Its totient is φ = 120832725312.

The previous prime is 121220009959. The next prime is 121220010011. The reversal of 121220010001 is 100010022121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100010022121 = 5939 ⋅16839539.

It can be written as a sum of positive squares in 2 ways, for example, as 20857136400 + 100362873601 = 144420^2 + 316801^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220010001 - 2⁷ = 121220009873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220010001.

It is not an unprimeable number, because it can be changed into a prime (121220010011) 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, 193641876 + ... + 193642501.

It is an arithmetic number, because the mean of its divisors is an integer number (30401823673).

Almost surely, 2^121220010001 is an apocalyptic number.

It is an amenable number.

121220010001 is a deficient number, since it is larger than the sum of its proper divisors (387284691).

121220010001 is an equidigital number, since it uses as much as digits as its factorization.

121220010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387284690.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121220010001 its reverse (100010022121), we get a palindrome (221230032122).

The spelling of 121220010001 in words is "one hundred twenty-one billion, two hundred twenty million, ten thousand, one".