21202211111121 has 12 divisors (see below), whose sum is σ = 31453129997172. Its totient is φ = 13752785585376.

The previous prime is 21202211111093. The next prime is 21202211111131. The reversal of 21202211111121 is 12111111220212.

It is a happy number.

21202211111121 is a `hidden beast` number, since 21 + 202 + 211 + 111 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12778401446721 + 8423809664400 = 3574689^2 + 2902380^2 .

It is not a de Polignac number, because 21202211111121 - 2⁵ = 21202211111089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202211111094 and 21202211111103.

It is not an unprimeable number, because it can be changed into a prime (21202211111131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31835151486 + ... + 31835152151.

It is an arithmetic number, because the mean of its divisors is an integer number (2621094166431).

Almost surely, 2^{21202211111121} is an apocalyptic number.

It is an amenable number.

21202211111121 is a deficient number, since it is larger than the sum of its proper divisors (10250918886051).

21202211111121 is a wasteful number, since it uses less digits than its factorization.

21202211111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63670303680 (or 63670303677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21202211111121 its reverse (12111111220212), we get a palindrome (33313322331333).

The spelling of 21202211111121 in words is "twenty-one trillion, two hundred two billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".