21375133530266 has 16 divisors (see below), whose sum is σ = 33957342853056. Its totient is φ = 10056337814976.

The previous prime is 21375133530263. The next prime is 21375133530301. The reversal of 21375133530266 is 66203533157312.

It is a self number, because there is not a number n which added to its sum of digits gives 21375133530266.

It is not an unprimeable number, because it can be changed into a prime (21375133530263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79506086 + ... + 79774481.

It is an arithmetic number, because the mean of its divisors is an integer number (2122333928316).

Almost surely, 2^{21375133530266} is an apocalyptic number.

21375133530266 is a deficient number, since it is larger than the sum of its proper divisors (12582209322790).

21375133530266 is a wasteful number, since it uses less digits than its factorization.

21375133530266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159284533.

The product of its (nonzero) digits is 2041200, while the sum is 47.

Adding to 21375133530266 its reverse (66203533157312), we get a palindrome (87578666687578).

The spelling of 21375133530266 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred thirty-three million, five hundred thirty thousand, two hundred sixty-six".