21322321331021 has 2 divisors, whose sum is σ = 21322321331022. Its totient is φ = 21322321331020.

The previous prime is 21322321330951. The next prime is 21322321331029. The reversal of 21322321331021 is 12013312322312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16228498028521 + 5093823302500 = 4028461^2 + 2256950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21322321331021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322321331029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661160665510 + 10661160665511.

It is an arithmetic number, because the mean of its divisors is an integer number (10661160665511).

Almost surely, 2^{21322321331021} is an apocalyptic number.

It is an amenable number.

21322321331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322321331021 is an equidigital number, since it uses as much as digits as its factorization.

21322321331021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21322321331021 its reverse (12013312322312), we get a palindrome (33335633653333).

The spelling of 21322321331021 in words is "twenty-one trillion, three hundred twenty-two billion, three hundred twenty-one million, three hundred thirty-one thousand, twenty-one".