21141121 has 4 divisors (see below), whose sum is σ = 21194244. Its totient is φ = 21088000.

The previous prime is 21141103. The next prime is 21141137. The reversal of 21141121 is 12114112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 8439025 = 3564^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141121 - 2⁵ = 21141089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141161) 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, 25960 + ... + 26761.

It is an arithmetic number, because the mean of its divisors is an integer number (5298561).

Almost surely, 2^21141121 is an apocalyptic number.

It is an amenable number.

21141121 is a deficient number, since it is larger than the sum of its proper divisors (53123).

21141121 is an equidigital number, since it uses as much as digits as its factorization.

21141121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53122.

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

The square root of 21141121 is about 4597.9474768640. The cubic root of 21141121 is about 276.5090418406.

Adding to 21141121 its reverse (12114112), we get a palindrome (33255233).

The spelling of 21141121 in words is "twenty-one million, one hundred forty-one thousand, one hundred twenty-one".