21375133530263 has 2 divisors, whose sum is σ = 21375133530264. Its totient is φ = 21375133530262.

The previous prime is 21375133530241. The next prime is 21375133530301. The reversal of 21375133530263 is 36203533157312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21375133530263 - 2¹⁴ = 21375133513879 is a prime.

It is a super-2 number, since 2×21375133530263² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21375133530463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687566765131 + 10687566765132.

It is an arithmetic number, because the mean of its divisors is an integer number (10687566765132).

Almost surely, 2^{21375133530263} is an apocalyptic number.

21375133530263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21375133530263 is an equidigital number, since it uses as much as digits as its factorization.

21375133530263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 44.

Adding to 21375133530263 its reverse (36203533157312), we get a palindrome (57578666687575).

The spelling of 21375133530263 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred thirty-three million, five hundred thirty thousand, two hundred sixty-three".