121201221001 has 16 divisors (see below), whose sum is σ = 142714750464. Its totient is φ = 100776582144.

The previous prime is 121201220971. The next prime is 121201221059. The reversal of 121201221001 is 100122102121.

It is not a de Polignac number, because 121201221001 - 2²⁵ = 121167666569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121201281001) 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, 1592880 + ... + 1667233.

It is an arithmetic number, because the mean of its divisors is an integer number (8919671904).

Almost surely, 2^121201221001 is an apocalyptic number.

It is an amenable number.

121201221001 is a deficient number, since it is larger than the sum of its proper divisors (21513529463).

121201221001 is a wasteful number, since it uses less digits than its factorization.

121201221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260280.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121201221001 its reverse (100122102121), we get a palindrome (221323323122).

The spelling of 121201221001 in words is "one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, one".