121220202212021 has 16 divisors (see below), whose sum is σ = 136629318059520. Its totient is φ = 106592365620720.

The previous prime is 121220202211967. The next prime is 121220202212063. The reversal of 121220202212021 is 120212202022121.

It is a cyclic number.

It is not a de Polignac number, because 121220202212021 - 2¹⁴ = 121220202195637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220202211984 and 121220202212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220202232021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1244026511 + ... + 1244123948.

It is an arithmetic number, because the mean of its divisors is an integer number (8539332378720).

Almost surely, 2^{121220202212021} is an apocalyptic number.

121220202212021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220202212021 is a deficient number, since it is larger than the sum of its proper divisors (15409115847499).

121220202212021 is a wasteful number, since it uses less digits than its factorization.

121220202212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488150616.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 121220202212021 its reverse (120212202022121), we get a palindrome (241432404234142).

The spelling of 121220202212021 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred two million, two hundred twelve thousand, twenty-one".