21005296333 has 16 divisors (see below), whose sum is σ = 24806080000. Its totient is φ = 17776611216.

The previous prime is 21005296321. The next prime is 21005296343. The reversal of 21005296333 is 33369250012.

It is a de Polignac number, because none of the positive numbers 2^k-21005296333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005296303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360498 + ... + 414691.

It is an arithmetic number, because the mean of its divisors is an integer number (1550380000).

Almost surely, 2^21005296333 is an apocalyptic number.

It is an amenable number.

21005296333 is a deficient number, since it is larger than the sum of its proper divisors (3800783667).

21005296333 is an frugal number, since it uses more digits than its factorization.

21005296333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775289 (or 775275 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 34.

The spelling of 21005296333 in words is "twenty-one billion, five million, two hundred ninety-six thousand, three hundred thirty-three".