21213544250303 has 2 divisors, whose sum is σ = 21213544250304. Its totient is φ = 21213544250302.

The previous prime is 21213544250293. The next prime is 21213544250323. The reversal of 21213544250303 is 30305244531212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213544250303 - 2³⁴ = 21196364381119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213544250323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606772125151 + 10606772125152.

It is an arithmetic number, because the mean of its divisors is an integer number (10606772125152).

Almost surely, 2^{21213544250303} is an apocalyptic number.

21213544250303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213544250303 is an equidigital number, since it uses as much as digits as its factorization.

21213544250303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21213544250303 its reverse (30305244531212), we get a palindrome (51518788781515).

The spelling of 21213544250303 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-four million, two hundred fifty thousand, three hundred three".