21302131222221 has 8 divisors (see below), whose sum is σ = 28402895268960. Its totient is φ = 14201393995152.

The previous prime is 21302131222181. The next prime is 21302131222241. The reversal of 21302131222221 is 12222213120312.

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

It is not a de Polignac number, because 21302131222221 - 2¹⁴ = 21302131205837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21302131222191 and 21302131222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302131222241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4772010 + ... + 8085563.

It is an arithmetic number, because the mean of its divisors is an integer number (3550361908620).

Almost surely, 2^{21302131222221} is an apocalyptic number.

It is an amenable number.

21302131222221 is a deficient number, since it is larger than the sum of its proper divisors (7100764046739).

21302131222221 is a wasteful number, since it uses less digits than its factorization.

21302131222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13409835.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21302131222221 its reverse (12222213120312), we get a palindrome (33524344342533).

The spelling of 21302131222221 in words is "twenty-one trillion, three hundred two billion, one hundred thirty-one million, two hundred twenty-two thousand, two hundred twenty-one".