2021220012021 has 16 divisors (see below), whose sum is σ = 3080694988800. Its totient is φ = 1154705107248.

The previous prime is 2021220012001. The next prime is 2021220012073. The reversal of 2021220012021 is 1202100221202.

It is not a de Polignac number, because 2021220012021 - 2¹⁵ = 2021219979253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021220012001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11483781 + ... + 11658458.

It is an arithmetic number, because the mean of its divisors is an integer number (192543436800).

Almost surely, 2^{2021220012021} is an apocalyptic number.

2021220012021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021220012021 is a deficient number, since it is larger than the sum of its proper divisors (1059474976779).

2021220012021 is a wasteful number, since it uses less digits than its factorization.

2021220012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23146408.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2021220012021 its reverse (1202100221202), we get a palindrome (3223320233223).

The spelling of 2021220012021 in words is "two trillion, twenty-one billion, two hundred twenty million, twelve thousand, twenty-one".