21201112110001 has 8 divisors (see below), whose sum is σ = 21448461843360. Its totient is φ = 20953965376608.

The previous prime is 21201112109999. The next prime is 21201112110023. The reversal of 21201112110001 is 10001121110212.

It is a happy number.

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 21201112110001 - 2¹ = 21201112109999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201112110071) 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, 50539891 + ... + 50957656.

It is an arithmetic number, because the mean of its divisors is an integer number (2681057730420).

Almost surely, 2^{21201112110001} is an apocalyptic number.

It is an amenable number.

21201112110001 is a deficient number, since it is larger than the sum of its proper divisors (247349733359).

21201112110001 is a wasteful number, since it uses less digits than its factorization.

21201112110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101499983.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21201112110001 its reverse (10001121110212), we get a palindrome (31202233220213).

The spelling of 21201112110001 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, one hundred ten thousand, one".