21200021001121 has 8 divisors (see below), whose sum is σ = 22121864994240. Its totient is φ = 20278185670512.

The previous prime is 21200021001119. The next prime is 21200021001157. The reversal of 21200021001121 is 12110012000212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21200021001121 - 2¹ = 21200021001119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200021001221) 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, 3108795 + ... + 7215583.

It is an arithmetic number, because the mean of its divisors is an integer number (2765233124280).

Almost surely, 2^{21200021001121} is an apocalyptic number.

It is an amenable number.

21200021001121 is a deficient number, since it is larger than the sum of its proper divisors (921843993119).

21200021001121 is a wasteful number, since it uses less digits than its factorization.

21200021001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331255.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21200021001121 its reverse (12110012000212), we get a palindrome (33310033001333).

Subtracting from 21200021001121 its reverse (12110012000212), we obtain a palindrome (9090009000909).

The spelling of 21200021001121 in words is "twenty-one trillion, two hundred billion, twenty-one million, one thousand, one hundred twenty-one".