21202323232021 has 8 divisors (see below), whose sum is σ = 21273555481880. Its totient is φ = 21131140197888.

The previous prime is 21202323232019. The next prime is 21202323232033. The reversal of 21202323232021 is 12023232320212.

It can be written as a sum of positive squares in 4 ways, for example, as 3002287409521 + 18200035822500 = 1732711^2 + 4266150^2 .

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 21202323232021 - 2¹ = 21202323232019 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 (21202323232621) 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, 11440776 + ... + 13164193.

It is an arithmetic number, because the mean of its divisors is an integer number (2659194435235).

Almost surely, 2^{21202323232021} is an apocalyptic number.

It is an amenable number.

21202323232021 is a deficient number, since it is larger than the sum of its proper divisors (71232249859).

21202323232021 is a wasteful number, since it uses less digits than its factorization.

21202323232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24607863.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21202323232021 its reverse (12023232320212), we get a palindrome (33225555552233).

It can be divided in two parts, 2 and 1202323232021, that multiplied together give a palindrome (2404646464042).

The spelling of 21202323232021 in words is "twenty-one trillion, two hundred two billion, three hundred twenty-three million, two hundred thirty-two thousand, twenty-one".