121001102001 has 24 divisors (see below), whose sum is σ = 190606532480. Its totient is φ = 73519651296.

The previous prime is 121001101981. The next prime is 121001102077. The reversal of 121001102001 is 100201100121.

It is a happy number.

It is not a de Polignac number, because 121001102001 - 2⁶ = 121001101937 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (121001102801) 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 23 ways as a sum of consecutive naturals, for example, 6536311 + ... + 6554796.

Almost surely, 2^121001102001 is an apocalyptic number.

It is an amenable number.

121001102001 is a deficient number, since it is larger than the sum of its proper divisors (69605430479).

121001102001 is a wasteful number, since it uses less digits than its factorization.

121001102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13091205 (or 13091202 counting only the distinct ones).

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

Adding to 121001102001 its reverse (100201100121), we get a palindrome (221202202122).

The spelling of 121001102001 in words is "one hundred twenty-one billion, one million, one hundred two thousand, one".