21011112120001 has 8 divisors (see below), whose sum is σ = 21068575231104. Its totient is φ = 20953650162480.

The previous prime is 21011112119941. The next prime is 21011112120007. The reversal of 21011112120001 is 10002121111012.

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 21011112120001 - 2⁷ = 21011112119873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011112120007) 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, 46583106 + ... + 47031988.

It is an arithmetic number, because the mean of its divisors is an integer number (2633571903888).

Almost surely, 2^{21011112120001} is an apocalyptic number.

It is an amenable number.

21011112120001 is a deficient number, since it is larger than the sum of its proper divisors (57463111103).

21011112120001 is a wasteful number, since it uses less digits than its factorization.

21011112120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576791.

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

Adding to 21011112120001 its reverse (10002121111012), we get a palindrome (31013233231013).

The spelling of 21011112120001 in words is "twenty-one trillion, eleven billion, one hundred twelve million, one hundred twenty thousand, one".