21303032243401 has 2 divisors, whose sum is σ = 21303032243402. Its totient is φ = 21303032243400.

The previous prime is 21303032243399. The next prime is 21303032243417. The reversal of 21303032243401 is 10434223030312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17279618079376 + 4023414164025 = 4156876^2 + 2005845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303032243401 - 2¹ = 21303032243399 is a prime.

Together with 21303032243399, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21303032243401.

It is not a weakly prime, because it can be changed into another prime (21303032243491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651516121700 + 10651516121701.

It is an arithmetic number, because the mean of its divisors is an integer number (10651516121701).

Almost surely, 2^{21303032243401} is an apocalyptic number.

It is an amenable number.

21303032243401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303032243401 is an equidigital number, since it uses as much as digits as its factorization.

21303032243401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21303032243401 its reverse (10434223030312), we get a palindrome (31737255273713).

The spelling of 21303032243401 in words is "twenty-one trillion, three hundred three billion, thirty-two million, two hundred forty-three thousand, four hundred one".