121220202102021 has 24 divisors (see below), whose sum is σ = 196176182932704. Its totient is φ = 71481200254560.

The previous prime is 121220202102001. The next prime is 121220202102121. The reversal of 121220202102021 is 120201202022121.

It is a happy number.

121220202102021 is a `hidden beast` number, since 1 + 212 + 20 + 20 + 210 + 202 + 1 = 666.

It is not a de Polignac number, because 121220202102021 - 2¹⁴ = 121220202085637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220202101985 and 121220202102003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220202102001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16546570471 + ... + 16546577796.

It is an arithmetic number, because the mean of its divisors is an integer number (8174007622196).

Almost surely, 2^{121220202102021} is an apocalyptic number.

121220202102021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220202102021 is a deficient number, since it is larger than the sum of its proper divisors (74955980830683).

121220202102021 is a wasteful number, since it uses less digits than its factorization.

121220202102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33093148321 (or 33093148318 counting only the distinct ones).

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

Adding to 121220202102021 its reverse (120201202022121), we get a palindrome (241421404124142).

The spelling of 121220202102021 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred two thousand, twenty-one".