2021120221021 has 6 divisors (see below), whose sum is σ = 2221561895966. Its totient is φ = 1837382019000.

The previous prime is 2021120221007. The next prime is 2021120221031. The reversal of 2021120221021 is 1201220211202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2009629452996 + 11490768025 = 1417614^2 + 107195^2 .

It is not a de Polignac number, because 2021120221021 - 2²⁷ = 2020986003293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021120220986 and 2021120221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021120221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8351736330 + ... + 8351736571.

Almost surely, 2^{2021120221021} is an apocalyptic number.

It is an amenable number.

2021120221021 is a deficient number, since it is larger than the sum of its proper divisors (200441674945).

2021120221021 is a wasteful number, since it uses less digits than its factorization.

2021120221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16703472923 (or 16703472912 counting only the distinct ones).

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

Adding to 2021120221021 its reverse (1201220211202), we get a palindrome (3222340432223).

The spelling of 2021120221021 in words is "two trillion, twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, twenty-one".