21600000001 has 4 divisors (see below), whose sum is σ = 21601021104. Its totient is φ = 21598978900.

The previous prime is 21599999969. The next prime is 21600000017. The reversal of 21600000001 is 10000000612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21600000001 - 2⁵ = 21599999969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21600000041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478135 + ... + 521356.

It is an arithmetic number, because the mean of its divisors is an integer number (5400255276).

Almost surely, 2^21600000001 is an apocalyptic number.

It is an amenable number.

21600000001 is a deficient number, since it is larger than the sum of its proper divisors (1021103).

21600000001 is an equidigital number, since it uses as much as digits as its factorization.

21600000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021102.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21600000001 its reverse (10000000612), we get a palindrome (31600000613).

The spelling of 21600000001 in words is "twenty-one billion, six hundred million, one", and thus it is an aban number.