12321638401 has 2 divisors, whose sum is σ = 12321638402. Its totient is φ = 12321638400.

The previous prime is 12321638387. The next prime is 12321638423. The reversal of 12321638401 is 10483612321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12321000000 + 638401 = 111000^2 + 799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12321638401 is a prime.

It is not a weakly prime, because it can be changed into another prime (12321638801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160819200 + 6160819201.

It is an arithmetic number, because the mean of its divisors is an integer number (6160819201).

Almost surely, 2^12321638401 is an apocalyptic number.

It is an amenable number.

12321638401 is a deficient number, since it is larger than the sum of its proper divisors (1).

12321638401 is an equidigital number, since it uses as much as digits as its factorization.

12321638401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

It can be divided in two parts, 12321 and 638401, that multiplied together give a square (7865738721 = 88689²).

The spelling of 12321638401 in words is "twelve billion, three hundred twenty-one million, six hundred thirty-eight thousand, four hundred one".