121001220001 has 4 divisors (see below), whose sum is σ = 121002002352. Its totient is φ = 121000437652.

The previous prime is 121001219953. The next prime is 121001220019. The reversal of 121001220001 is 100022100121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 100022100121 = 19 ⋅5264321059.

It is a cyclic number.

It is not a de Polignac number, because 121001220001 - 2⁷ = 121001219873 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 121001220001.

It is not an unprimeable number, because it can be changed into a prime (121001220071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72811 + ... + 497296.

It is an arithmetic number, because the mean of its divisors is an integer number (30250500588).

Almost surely, 2^121001220001 is an apocalyptic number.

It is an amenable number.

121001220001 is a deficient number, since it is larger than the sum of its proper divisors (782351).

121001220001 is an equidigital number, since it uses as much as digits as its factorization.

121001220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782350.

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

Adding to 121001220001 its reverse (100022100121), we get a palindrome (221023320122).

The spelling of 121001220001 in words is "one hundred twenty-one billion, one million, two hundred twenty thousand, one".