121220121002121 has 6 divisors (see below), whose sum is σ = 175095730336410. Its totient is φ = 80813414001408.

The previous prime is 121220121002119. The next prime is 121220121002129. The reversal of 121220121002121 is 121200121022121.

121220121002121 is a `hidden beast` number, since 1 + 21 + 220 + 1 + 210 + 0 + 212 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78578385158025 + 42641735844096 = 8864445^2 + 6530064^2 .

It is not a de Polignac number, because 121220121002121 - 2¹ = 121220121002119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220121002094 and 121220121002103.

It is not an unprimeable number, because it can be changed into a prime (121220121002129) 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 5 ways as a sum of consecutive naturals, for example, 6734451166776 + ... + 6734451166793.

It is an arithmetic number, because the mean of its divisors is an integer number (29182621722735).

Almost surely, 2^{121220121002121} is an apocalyptic number.

It is an amenable number.

121220121002121 is a deficient number, since it is larger than the sum of its proper divisors (53875609334289).

121220121002121 is a wasteful number, since it uses less digits than its factorization.

121220121002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13468902333575 (or 13468902333572 counting only the distinct ones).

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

Adding to 121220121002121 its reverse (121200121022121), we get a palindrome (242420242024242).

The spelling of 121220121002121 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, one hundred twenty-one".