21004616633 has 48 divisors (see below), whose sum is σ = 28577082240. Its totient is φ = 15022402560.

The previous prime is 21004616593. The next prime is 21004616671. The reversal of 21004616633 is 33661640012.

It is not a de Polignac number, because 21004616633 - 2⁸ = 21004616377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004616633.

It is not an unprimeable number, because it can be changed into a prime (21004616533) 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 in 47 ways as a sum of consecutive naturals, for example, 1965641 + ... + 1976297.

It is an arithmetic number, because the mean of its divisors is an integer number (595355880).

Almost surely, 2^21004616633 is an apocalyptic number.

It is an amenable number.

21004616633 is a deficient number, since it is larger than the sum of its proper divisors (7572465607).

21004616633 is a wasteful number, since it uses less digits than its factorization.

21004616633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878 (or 10867 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21004616633 in words is "twenty-one billion, four million, six hundred sixteen thousand, six hundred thirty-three".