21321311212301 has 2 divisors, whose sum is σ = 21321311212302. Its totient is φ = 21321311212300.

The previous prime is 21321311212291. The next prime is 21321311212307. The reversal of 21321311212301 is 10321211312312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11535838638025 + 9785472574276 = 3396445^2 + 3128174^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321311212301 - 2¹⁸ = 21321310950157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321311212307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660655606150 + 10660655606151.

It is an arithmetic number, because the mean of its divisors is an integer number (10660655606151).

Almost surely, 2^{21321311212301} is an apocalyptic number.

It is an amenable number.

21321311212301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321311212301 is an equidigital number, since it uses as much as digits as its factorization.

21321311212301 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 23.

Adding to 21321311212301 its reverse (10321211312312), we get a palindrome (31642522524613).

The spelling of 21321311212301 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred eleven million, two hundred twelve thousand, three hundred one".