21020212200021 has 16 divisors (see below), whose sum is σ = 29928666984960. Its totient is φ = 13093791802560.

The previous prime is 21020212200019. The next prime is 21020212200059. The reversal of 21020212200021 is 12000221202012.

It is not a de Polignac number, because 21020212200021 - 2¹ = 21020212200019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020212200061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3896959150 + ... + 3896964543.

It is an arithmetic number, because the mean of its divisors is an integer number (1870541686560).

Almost surely, 2^{21020212200021} is an apocalyptic number.

It is an amenable number.

21020212200021 is a deficient number, since it is larger than the sum of its proper divisors (8908454784939).

21020212200021 is a wasteful number, since it uses less digits than its factorization.

21020212200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793923756.

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

Adding to 21020212200021 its reverse (12000221202012), we get a palindrome (33020433402033).

The spelling of 21020212200021 in words is "twenty-one trillion, twenty billion, two hundred twelve million, two hundred thousand, twenty-one".