21220202012021 has 8 divisors (see below), whose sum is σ = 21713872244064. Its totient is φ = 20726539832880.

The previous prime is 21220202011997. The next prime is 21220202012033. The reversal of 21220202012021 is 12021020202212.

It is a happy number.

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 21220202012021 - 2²² = 21220197817717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220202012921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3491330 + ... + 7391196.

It is an arithmetic number, because the mean of its divisors is an integer number (2714234030508).

Almost surely, 2^{21220202012021} is an apocalyptic number.

It is an amenable number.

21220202012021 is a deficient number, since it is larger than the sum of its proper divisors (493670232043).

21220202012021 is a wasteful number, since it uses less digits than its factorization.

21220202012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026451.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220202012021 its reverse (12021020202212), we get a palindrome (33241222214233).

The spelling of 21220202012021 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, twelve thousand, twenty-one".