121020202021 has 4 divisors (see below), whose sum is σ = 128139037452. Its totient is φ = 113901366592.

The previous prime is 121020202019. The next prime is 121020202031. The reversal of 121020202021 is 120202020121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75742745796 + 45277456225 = 275214^2 + 212785^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020202021 - 2¹ = 121020202019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020201992 and 121020202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020202031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559417690 + ... + 3559417723.

It is an arithmetic number, because the mean of its divisors is an integer number (32034759363).

Almost surely, 2^121020202021 is an apocalyptic number.

It is an amenable number.

121020202021 is a deficient number, since it is larger than the sum of its proper divisors (7118835431).

121020202021 is an equidigital number, since it uses as much as digits as its factorization.

121020202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118835430.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121020202021 its reverse (120202020121), we get a palindrome (241222222142).

The spelling of 121020202021 in words is "one hundred twenty-one billion, twenty million, two hundred two thousand, twenty-one".