121200120112221 has 6 divisors (see below), whose sum is σ = 175066840162110. Its totient is φ = 80800080074808.

The previous prime is 121200120112079. The next prime is 121200120112289. The reversal of 121200120112221 is 122211021002121.

121200120112221 is a `hidden beast` number, since 1 + 212 + 0 + 0 + 120 + 112 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 113208536002500 + 7991584109721 = 10639950^2 + 2826939^2 .

It is not a de Polignac number, because 121200120112221 - 2¹³ = 121200120104029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121200120112194 and 121200120112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200120116221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6733340006226 + ... + 6733340006243.

It is an arithmetic number, because the mean of its divisors is an integer number (29177806693685).

Almost surely, 2^{121200120112221} is an apocalyptic number.

It is an amenable number.

121200120112221 is a deficient number, since it is larger than the sum of its proper divisors (53866720049889).

121200120112221 is a wasteful number, since it uses less digits than its factorization.

121200120112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466680012475 (or 13466680012472 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121200120112221 its reverse (122211021002121), we get a palindrome (243411141114342).

The spelling of 121200120112221 in words is "one hundred twenty-one trillion, two hundred billion, one hundred twenty million, one hundred twelve thousand, two hundred twenty-one".