21303021010321 has 2 divisors, whose sum is σ = 21303021010322. Its totient is φ = 21303021010320.

The previous prime is 21303021010307. The next prime is 21303021010351. The reversal of 21303021010321 is 12301012030312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21199394318400 + 103626691921 = 4604280^2 + 321911^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303021010321 - 2¹¹ = 21303021008273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21303021010351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651510505160 + 10651510505161.

It is an arithmetic number, because the mean of its divisors is an integer number (10651510505161).

Almost surely, 2^{21303021010321} is an apocalyptic number.

It is an amenable number.

21303021010321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303021010321 is an equidigital number, since it uses as much as digits as its factorization.

21303021010321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21303021010321 its reverse (12301012030312), we get a palindrome (33604033040633).

The spelling of 21303021010321 in words is "twenty-one trillion, three hundred three billion, twenty-one million, ten thousand, three hundred twenty-one".