21211001121 has 8 divisors (see below), whose sum is σ = 28282010400. Its totient is φ = 14140329632.

The previous prime is 21211001093. The next prime is 21211001129. The reversal of 21211001121 is 12110011212.

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

It is a cyclic number.

It is not a de Polignac number, because 21211001121 - 2⁵ = 21211001089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211001097 and 21211001106.

It is not an unprimeable number, because it can be changed into a prime (21211001129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183826 + ... + 276068.

It is an arithmetic number, because the mean of its divisors is an integer number (3535251300).

Almost surely, 2^21211001121 is an apocalyptic number.

It is an amenable number.

21211001121 is a deficient number, since it is larger than the sum of its proper divisors (7071009279).

21211001121 is an equidigital number, since it uses as much as digits as its factorization.

21211001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168895.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211001121 its reverse (12110011212), we get a palindrome (33321012333).

It can be divided in two parts, 2 and 1211001121, that multiplied together give a palindrome (2422002242).

The spelling of 21211001121 in words is "twenty-one billion, two hundred eleven million, one thousand, one hundred twenty-one".