21404056633 has 8 divisors (see below), whose sum is σ = 21662136320. Its totient is φ = 21147376320.

The previous prime is 21404056627. The next prime is 21404056649. The reversal of 21404056633 is 33665040412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404056633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404056613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319053 + ... + 380266.

It is an arithmetic number, because the mean of its divisors is an integer number (2707767040).

Almost surely, 2^21404056633 is an apocalyptic number.

It is an amenable number.

21404056633 is a deficient number, since it is larger than the sum of its proper divisors (258079687).

21404056633 is a wasteful number, since it uses less digits than its factorization.

21404056633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699687.

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 21404056633 in words is "twenty-one billion, four hundred four million, fifty-six thousand, six hundred thirty-three".