121203100221 has 16 divisors (see below), whose sum is σ = 191059075200. Its totient is φ = 66870675648.

The previous prime is 121203100219. The next prime is 121203100247. The reversal of 121203100221 is 122001302121.

It is not a de Polignac number, because 121203100221 - 2¹ = 121203100219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121203100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121203110221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99509326 + ... + 99510543.

It is an arithmetic number, because the mean of its divisors is an integer number (11941192200).

Almost surely, 2^121203100221 is an apocalyptic number.

It is an amenable number.

121203100221 is a deficient number, since it is larger than the sum of its proper divisors (69855974979).

121203100221 is a wasteful number, since it uses less digits than its factorization.

121203100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199019908.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121203100221 its reverse (122001302121), we get a palindrome (243204402342).

The spelling of 121203100221 in words is "one hundred twenty-one billion, two hundred three million, one hundred thousand, two hundred twenty-one".