21221300323 has 2 divisors, whose sum is σ = 21221300324. Its totient is φ = 21221300322.

The previous prime is 21221300299. The next prime is 21221300369. The reversal of 21221300323 is 32300312212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221300323 - 2⁵ = 21221300291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221300323.

It is not a weakly prime, because it can be changed into another prime (21221307323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610650161 + 10610650162.

It is an arithmetic number, because the mean of its divisors is an integer number (10610650162).

Almost surely, 2^21221300323 is an apocalyptic number.

21221300323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221300323 is an equidigital number, since it uses as much as digits as its factorization.

21221300323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21221300323 its reverse (32300312212), we get a palindrome (53521612535).

The spelling of 21221300323 in words is "twenty-one billion, two hundred twenty-one million, three hundred thousand, three hundred twenty-three".