21020221011021 has 8 divisors (see below), whose sum is σ = 28027358292864. Its totient is φ = 14013282201600.

The previous prime is 21020221011001. The next prime is 21020221011029. The reversal of 21020221011021 is 12011012202012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21020221011021 - 2¹¹ = 21020221008973 is a prime.

It is a super-3 number, since 3×21020221011021³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020221011029) 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 7 ways as a sum of consecutive naturals, for example, 49370805 + ... + 49794746.

It is an arithmetic number, because the mean of its divisors is an integer number (3503419786608).

Almost surely, 2^{21020221011021} is an apocalyptic number.

It is an amenable number.

21020221011021 is a deficient number, since it is larger than the sum of its proper divisors (7007137281843).

21020221011021 is an equidigital number, since it uses as much as digits as its factorization.

21020221011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99236211.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21020221011021 its reverse (12011012202012), we get a palindrome (33031233213033).

The spelling of 21020221011021 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, eleven thousand, twenty-one".