121000102001 has 4 divisors (see below), whose sum is σ = 121084778100. Its totient is φ = 120915425904.

The previous prime is 121000101991. The next prime is 121000102039. The reversal of 121000102001 is 100201000121.

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 57084677776 + 63915424225 = 238924^2 + 252815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121000102001 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 121000102001.

It is not an unprimeable number, because it can be changed into a prime (121000102051) 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, 42335906 + ... + 42338763.

It is an arithmetic number, because the mean of its divisors is an integer number (30271194525).

Almost surely, 2^121000102001 is an apocalyptic number.

It is an amenable number.

121000102001 is a deficient number, since it is larger than the sum of its proper divisors (84676099).

121000102001 is an equidigital number, since it uses as much as digits as its factorization.

121000102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84676098.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121000102001 its reverse (100201000121), we get a palindrome (221201102122).

The spelling of 121000102001 in words is "one hundred twenty-one billion, one hundred two thousand, one".