21200201121121 has 4 divisors (see below), whose sum is σ = 23127492132144. Its totient is φ = 19272910110100.

The previous prime is 21200201121109. The next prime is 21200201121137. The reversal of 21200201121121 is 12112110200212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21200201121121 - 2⁷ = 21200201120993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200201121095 and 21200201121104.

It is not an unprimeable number, because it can be changed into a prime (21200201121191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963645505495 + ... + 963645505516.

It is an arithmetic number, because the mean of its divisors is an integer number (5781873033036).

Almost surely, 2^{21200201121121} is an apocalyptic number.

It is an amenable number.

21200201121121 is a deficient number, since it is larger than the sum of its proper divisors (1927291011023).

21200201121121 is a wasteful number, since it uses less digits than its factorization.

21200201121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927291011022.

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

Adding to 21200201121121 its reverse (12112110200212), we get a palindrome (33312311321333).

The spelling of 21200201121121 in words is "twenty-one trillion, two hundred billion, two hundred one million, one hundred twenty-one thousand, one hundred twenty-one".