121002120220221 has 12 divisors (see below), whose sum is σ = 174832657984348. Its totient is φ = 80644164300864.

The previous prime is 121002120220171. The next prime is 121002120220283. The reversal of 121002120220221 is 122022021200121.

It is a happy number.

121002120220221 is a `hidden beast` number, since 1 + 2 + 10 + 0 + 212 + 0 + 220 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 80630252919225 + 40371867300996 = 8979435^2 + 6353886^2 .

It is not a de Polignac number, because 121002120220221 - 2¹⁸ = 121002119958077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121002120220194 and 121002120220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002120270221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1992955120 + ... + 1993015833.

Almost surely, 2^{121002120220221} is an apocalyptic number.

It is an amenable number.

121002120220221 is a deficient number, since it is larger than the sum of its proper divisors (53830537764127).

121002120220221 is a wasteful number, since it uses less digits than its factorization.

121002120220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985974332 (or 3985974329 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121002120220221 its reverse (122022021200121), we get a palindrome (243024141420342).

The spelling of 121002120220221 in words is "one hundred twenty-one trillion, two billion, one hundred twenty million, two hundred twenty thousand, two hundred twenty-one".