121120202112021 has 18 divisors (see below), whose sum is σ = 203514897427062. Its totient is φ = 69211544063760.

The previous prime is 121120202111999. The next prime is 121120202112029. The reversal of 121120202112021 is 120211202021121.

121120202112021 is a `hidden beast` number, since 1 + 211 + 20 + 20 + 211 + 202 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 119388161867121 + 1732040244900 = 10926489^2 + 1316070^2 .

It is not a de Polignac number, because 121120202112021 - 2¹⁰ = 121120202110997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121120202111985 and 121120202112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120202112029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 137324491750 + ... + 137324492631.

Almost surely, 2^{121120202112021} is an apocalyptic number.

It is an amenable number.

121120202112021 is a deficient number, since it is larger than the sum of its proper divisors (82394695315041).

121120202112021 is a wasteful number, since it uses less digits than its factorization.

121120202112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274648984401 (or 274648984391 counting only the distinct ones).

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

Adding to 121120202112021 its reverse (120211202021121), we get a palindrome (241331404133142).

The spelling of 121120202112021 in words is "one hundred twenty-one trillion, one hundred twenty billion, two hundred two million, one hundred twelve thousand, twenty-one".