21034505233 has 12 divisors (see below), whose sum is σ = 25065510372. Its totient is φ = 17589828480.

The previous prime is 21034505231. The next prime is 21034505251. The reversal of 21034505233 is 33250543012.

It can be written as a sum of positive squares in 2 ways, for example, as 8803693584 + 12230811649 = 93828^2 + 110593^2 .

It is not a de Polignac number, because 21034505233 - 2¹ = 21034505231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21034505231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5233060 + ... + 5237077.

It is an arithmetic number, because the mean of its divisors is an integer number (2088792531).

Almost surely, 2^21034505233 is an apocalyptic number.

It is an amenable number.

21034505233 is a deficient number, since it is larger than the sum of its proper divisors (4031005139).

21034505233 is a wasteful number, since it uses less digits than its factorization.

21034505233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10470192 (or 10470185 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

The spelling of 21034505233 in words is "twenty-one billion, thirty-four million, five hundred five thousand, two hundred thirty-three".