21886766533 has 2 divisors, whose sum is σ = 21886766534. Its totient is φ = 21886766532.

The previous prime is 21886766513. The next prime is 21886766543. The reversal of 21886766533 is 33566768812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20225959524 + 1660807009 = 142218^2 + 40753^2 .

It is a cyclic number.

It is not a de Polignac number, because 21886766533 - 2³³ = 13296831941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21886766513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943383266 + 10943383267.

It is an arithmetic number, because the mean of its divisors is an integer number (10943383267).

Almost surely, 2^21886766533 is an apocalyptic number.

It is an amenable number.

21886766533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21886766533 is an equidigital number, since it uses as much as digits as its factorization.

21886766533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 55.

The spelling of 21886766533 in words is "twenty-one billion, eight hundred eighty-six million, seven hundred sixty-six thousand, five hundred thirty-three".