121200001001 has 2 divisors, whose sum is σ = 121200001002. Its totient is φ = 121200001000.

The previous prime is 121200000997. The next prime is 121200001009. The reversal of 121200001001 is 100100002121.

It is an a-pointer prime, because the next prime (121200001009) can be obtained adding 121200001001 to its sum of digits (8).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121156901776 + 43099225 = 348076^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200001001 - 2² = 121200000997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121200001001.

It is not a weakly prime, because it can be changed into another prime (121200001009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600000500 + 60600000501.

It is an arithmetic number, because the mean of its divisors is an integer number (60600000501).

Almost surely, 2^121200001001 is an apocalyptic number.

It is an amenable number.

121200001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200001001 is an equidigital number, since it uses as much as digits as its factorization.

121200001001 is an evil number, because the sum of its binary digits is even.

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

Adding to 121200001001 its reverse (100100002121), we get a palindrome (221300003122).

The spelling of 121200001001 in words is "one hundred twenty-one billion, two hundred million, one thousand, one".