21377875033 has 2 divisors, whose sum is σ = 21377875034. Its totient is φ = 21377875032.

The previous prime is 21377875031. The next prime is 21377875039. The reversal of 21377875033 is 33057877312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14153385024 + 7224490009 = 118968^2 + 84997^2 .

It is a cyclic number.

It is not a de Polignac number, because 21377875033 - 2¹ = 21377875031 is a prime.

Together with 21377875031, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21377875031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688937516 + 10688937517.

It is an arithmetic number, because the mean of its divisors is an integer number (10688937517).

Almost surely, 2^21377875033 is an apocalyptic number.

It is an amenable number.

21377875033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377875033 is an equidigital number, since it uses as much as digits as its factorization.

21377875033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 740880, while the sum is 46.

The spelling of 21377875033 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred seventy-five thousand, thirty-three".