21201120201121 has 16 divisors (see below), whose sum is σ = 25655394542976. Its totient is φ = 17103253038336.

The previous prime is 21201120201119. The next prime is 21201120201193. The reversal of 21201120201121 is 12110202110212.

It is a cyclic number.

It is not a de Polignac number, because 21201120201121 - 2¹ = 21201120201119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201120201095 and 21201120201104.

It is not an unprimeable number, because it can be changed into a prime (21201120201721) 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, 11761815 + ... + 13444051.

It is an arithmetic number, because the mean of its divisors is an integer number (1603462158936).

Almost surely, 2^{21201120201121} is an apocalyptic number.

It is an amenable number.

21201120201121 is a deficient number, since it is larger than the sum of its proper divisors (4454274341855).

21201120201121 is a wasteful number, since it uses less digits than its factorization.

21201120201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788168.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201120201121 its reverse (12110202110212), we get a palindrome (33311322311333).

The spelling of 21201120201121 in words is "twenty-one trillion, two hundred one billion, one hundred twenty million, two hundred one thousand, one hundred twenty-one".