2021120202121 has 4 divisors (see below), whose sum is σ = 2022003947392. Its totient is φ = 2020236456852.

The previous prime is 2021120202083. The next prime is 2021120202181. The reversal of 2021120202121 is 1212020211202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021120202121 - 2⁹ = 2021120201609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021120202095 and 2021120202104.

It is not an unprimeable number, because it can be changed into a prime (2021120202181) 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, 441869205 + ... + 441873778.

It is an arithmetic number, because the mean of its divisors is an integer number (505500986848).

Almost surely, 2^{2021120202121} is an apocalyptic number.

It is an amenable number.

2021120202121 is a deficient number, since it is larger than the sum of its proper divisors (883745271).

2021120202121 is an equidigital number, since it uses as much as digits as its factorization.

2021120202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883745270.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021120202121 its reverse (1212020211202), we get a palindrome (3233140413323).

The spelling of 2021120202121 in words is "two trillion, twenty-one billion, one hundred twenty million, two hundred two thousand, one hundred twenty-one".