21600215889 has 32 divisors (see below), whose sum is σ = 33253300224. Its totient is φ = 12216288000.

The previous prime is 21600215851. The next prime is 21600215893. The reversal of 21600215889 is 98851200612.

It is a happy number.

It is not a de Polignac number, because 21600215889 - 2⁸ = 21600215633 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21600215889.

It is not an unprimeable number, because it can be changed into a prime (21600215389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1757014 + ... + 1769264.

It is an arithmetic number, because the mean of its divisors is an integer number (1039165632).

Almost surely, 2^21600215889 is an apocalyptic number.

It is an amenable number.

21600215889 is a deficient number, since it is larger than the sum of its proper divisors (11653084335).

21600215889 is a wasteful number, since it uses less digits than its factorization.

21600215889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13117.

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 21600215889 in words is "twenty-one billion, six hundred million, two hundred fifteen thousand, eight hundred eighty-nine".