21201112001 has 8 divisors (see below), whose sum is σ = 21309050880. Its totient is φ = 21093318432.

The previous prime is 21201111991. The next prime is 21201112003. The reversal of 21201112001 is 10021110212.

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-21201112001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201112003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262436 + ... + 333578.

It is an arithmetic number, because the mean of its divisors is an integer number (2663631360).

Almost surely, 2^21201112001 is an apocalyptic number.

It is an amenable number.

21201112001 is a deficient number, since it is larger than the sum of its proper divisors (107938879).

21201112001 is a wasteful number, since it uses less digits than its factorization.

21201112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72655.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21201112001 its reverse (10021110212), we get a palindrome (31222222213).

The spelling of 21201112001 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, one".