21201021112001 has 16 divisors (see below), whose sum is σ = 21330405139968. Its totient is φ = 21072039408000.

The previous prime is 21201021111973. The next prime is 21201021112003. The reversal of 21201021112001 is 10021112010212.

It is a cyclic number.

It is not a de Polignac number, because 21201021112001 - 2²² = 21201016917697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201021112003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 816950576 + ... + 816976526.

It is an arithmetic number, because the mean of its divisors is an integer number (1333150321248).

Almost surely, 2^{21201021112001} is an apocalyptic number.

It is an amenable number.

21201021112001 is a deficient number, since it is larger than the sum of its proper divisors (129384027967).

21201021112001 is a wasteful number, since it uses less digits than its factorization.

21201021112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33512.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201021112001 its reverse (10021112010212), we get a palindrome (31222133122213).

The spelling of 21201021112001 in words is "twenty-one trillion, two hundred one billion, twenty-one million, one hundred twelve thousand, one".