21020020220221 has 8 divisors (see below), whose sum is σ = 23039608550688. Its totient is φ = 19018544790000.

The previous prime is 21020020220207. The next prime is 21020020220233. The reversal of 21020020220221 is 12202202002012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020020220221 - 2¹¹ = 21020020218173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020020220195 and 21020020220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020020230221) 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, 4528222630 + ... + 4528227271.

It is an arithmetic number, because the mean of its divisors is an integer number (2879951068836).

Almost surely, 2^{21020020220221} is an apocalyptic number.

It is an amenable number.

21020020220221 is a deficient number, since it is larger than the sum of its proper divisors (2019588330467).

21020020220221 is a wasteful number, since it uses less digits than its factorization.

21020020220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9056450123.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020020220221 its reverse (12202202002012), we get a palindrome (33222222222233).

The spelling of 21020020220221 in words is "twenty-one trillion, twenty billion, twenty million, two hundred twenty thousand, two hundred twenty-one".