121201012012221 has 16 divisors (see below), whose sum is σ = 179560412740800. Its totient is φ = 80799163616304.

The previous prime is 121201012012207. The next prime is 121201012012231. The reversal of 121201012012221 is 122210210102121.

121201012012221 is a `hidden beast` number, since 121 + 20 + 101 + 201 + 2 + 221 = 666.

It is not a de Polignac number, because 121201012012221 - 2¹⁰ = 121201012011197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201012012194 and 121201012012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201012012231) 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, 40502406 + ... + 43391783.

It is an arithmetic number, because the mean of its divisors is an integer number (11222525796300).

Almost surely, 2^{121201012012221} is an apocalyptic number.

It is an amenable number.

121201012012221 is a deficient number, since it is larger than the sum of its proper divisors (58359400728579).

121201012012221 is an equidigital number, since it uses as much as digits as its factorization.

121201012012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83947705 (or 83947699 counting only the distinct ones).

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

Adding to 121201012012221 its reverse (122210210102121), we get a palindrome (243411222114342).

The spelling of 121201012012221 in words is "one hundred twenty-one trillion, two hundred one billion, twelve million, twelve thousand, two hundred twenty-one".