21634788033 has 12 divisors (see below), whose sum is σ = 31915148928. Its totient is φ = 14116315320.

The previous prime is 21634788029. The next prime is 21634788061. The reversal of 21634788033 is 33088743612.

21634788033 is a `hidden beast` number, since 2 + 1 + 634 + 7 + 8 + 8 + 0 + 3 + 3 = 666.

It is not a de Polignac number, because 21634788033 - 2² = 21634788029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21634788033.

It is not an unprimeable number, because it can be changed into a prime (21634788073) 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, 25572613 + ... + 25573458.

It is an arithmetic number, because the mean of its divisors is an integer number (2659595744).

Almost surely, 2^21634788033 is an apocalyptic number.

It is an amenable number.

21634788033 is a deficient number, since it is larger than the sum of its proper divisors (10280360895).

21634788033 is a wasteful number, since it uses less digits than its factorization.

21634788033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51146124 (or 51146121 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 21634788033 in words is "twenty-one billion, six hundred thirty-four million, seven hundred eighty-eight thousand, thirty-three".