21302030122321 has 4 divisors (see below), whose sum is σ = 22940647824052. Its totient is φ = 19663412420592.

The previous prime is 21302030122309. The next prime is 21302030122357. The reversal of 21302030122321 is 12322103020312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5333494638096 + 15968535484225 = 2309436^2 + 3996065^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302030122321 - 2³³ = 21293440187729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302030122292 and 21302030122301.

It is not an unprimeable number, because it can be changed into a prime (21302030122381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819308850846 + ... + 819308850871.

It is an arithmetic number, because the mean of its divisors is an integer number (5735161956013).

Almost surely, 2^{21302030122321} is an apocalyptic number.

It is an amenable number.

21302030122321 is a deficient number, since it is larger than the sum of its proper divisors (1638617701731).

21302030122321 is a wasteful number, since it uses less digits than its factorization.

21302030122321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638617701730.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21302030122321 its reverse (12322103020312), we get a palindrome (33624133142633).

The spelling of 21302030122321 in words is "twenty-one trillion, three hundred two billion, thirty million, one hundred twenty-two thousand, three hundred twenty-one".