1201000121001 has 16 divisors (see below), whose sum is σ = 1779609408000. Its totient is φ = 800509261104.

The previous prime is 1201000120987. The next prime is 1201000121021. The reversal of 1201000121001 is 1001210001021.

It is a happy number.

It is not a de Polignac number, because 1201000121001 - 2³⁰ = 1199926379177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201000121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4234726 + ... + 4509423.

It is an arithmetic number, because the mean of its divisors is an integer number (111225588000).

Almost surely, 2^{1201000121001} is an apocalyptic number.

It is an amenable number.

1201000121001 is a deficient number, since it is larger than the sum of its proper divisors (578609286999).

1201000121001 is an equidigital number, since it uses as much as digits as its factorization.

1201000121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8749245 (or 8749239 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1201000121001 its reverse (1001210001021), we get a palindrome (2202210122022).

The spelling of 1201000121001 in words is "one trillion, two hundred one billion, one hundred twenty-one thousand, one".