121200100010221 has 16 divisors (see below), whose sum is σ = 125577430617600. Its totient is φ = 116852699620800.

The previous prime is 121200100010201. The next prime is 121200100010233. The reversal of 121200100010221 is 122010001002121.

It is a cyclic number.

It is not a de Polignac number, because 121200100010221 - 2¹¹ = 121200100008173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200100010201) 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, 4508511 + ... + 16208851.

It is an arithmetic number, because the mean of its divisors is an integer number (7848589413600).

Almost surely, 2^{121200100010221} is an apocalyptic number.

It is an amenable number.

121200100010221 is a deficient number, since it is larger than the sum of its proper divisors (4377330607379).

121200100010221 is a wasteful number, since it uses less digits than its factorization.

121200100010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11701620.

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

Adding to 121200100010221 its reverse (122010001002121), we get a palindrome (243210101012342).

The spelling of 121200100010221 in words is "one hundred twenty-one trillion, two hundred billion, one hundred million, ten thousand, two hundred twenty-one".