2021121022021 has 4 divisors (see below), whose sum is σ = 2045471877792. Its totient is φ = 1996770166252.

The previous prime is 2021121021971. The next prime is 2021121022033. The reversal of 2021121022021 is 1202201211202.

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 2021121022021 - 2³⁵ = 1986761283653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021121021986 and 2021121022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121022061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12175427761 + ... + 12175427926.

It is an arithmetic number, because the mean of its divisors is an integer number (511367969448).

Almost surely, 2^{2021121022021} is an apocalyptic number.

It is an amenable number.

2021121022021 is a deficient number, since it is larger than the sum of its proper divisors (24350855771).

2021121022021 is an equidigital number, since it uses as much as digits as its factorization.

2021121022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24350855770.

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

Adding to 2021121022021 its reverse (1202201211202), we get a palindrome (3223322233223).

The spelling of 2021121022021 in words is "two trillion, twenty-one billion, one hundred twenty-one million, twenty-two thousand, twenty-one".