1201121200221 has 16 divisors (see below), whose sum is σ = 1603746165120. Its totient is φ = 799622046720.

The previous prime is 1201121200141. The next prime is 1201121200249. The reversal of 1201121200221 is 1220021211021.

It is not a de Polignac number, because 1201121200221 - 2⁹ = 1201121199709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201121200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201121200021) 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, 38245101 + ... + 38276493.

It is an arithmetic number, because the mean of its divisors is an integer number (100234135320).

Almost surely, 2^{1201121200221} is an apocalyptic number.

It is an amenable number.

1201121200221 is a deficient number, since it is larger than the sum of its proper divisors (402624964899).

1201121200221 is a wasteful number, since it uses less digits than its factorization.

1201121200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48916.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201121200221 its reverse (1220021211021), we get a palindrome (2421142411242).

The spelling of 1201121200221 in words is "one trillion, two hundred one billion, one hundred twenty-one million, two hundred thousand, two hundred twenty-one".