21600885729 has 8 divisors (see below), whose sum is σ = 30495368160. Its totient is φ = 13553496896.

The previous prime is 21600885701. The next prime is 21600885731. The reversal of 21600885729 is 92758800612.

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

It is a cyclic number.

It is not a de Polignac number, because 21600885729 - 2⁸ = 21600885473 is a prime.

It is a super-2 number, since 2×21600885729² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21600885029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211773339 + ... + 211773440.

It is an arithmetic number, because the mean of its divisors is an integer number (3811921020).

Almost surely, 2^21600885729 is an apocalyptic number.

It is an amenable number.

21600885729 is a deficient number, since it is larger than the sum of its proper divisors (8894482431).

21600885729 is a wasteful number, since it uses less digits than its factorization.

21600885729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423546799.

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 21600885729 in words is "twenty-one billion, six hundred million, eight hundred eighty-five thousand, seven hundred twenty-nine".