21141321 has 4 divisors (see below), whose sum is σ = 28188432. Its totient is φ = 14094212.

The previous prime is 21141317. The next prime is 21141361. The reversal of 21141321 is 12314112.

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 21141321 - 2² = 21141317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21141321.

It is not an unprimeable number, because it can be changed into a prime (21141361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3523551 + ... + 3523556.

It is an arithmetic number, because the mean of its divisors is an integer number (7047108).

Almost surely, 2^21141321 is an apocalyptic number.

It is an amenable number.

21141321 is a deficient number, since it is larger than the sum of its proper divisors (7047111).

21141321 is an equidigital number, since it uses as much as digits as its factorization.

21141321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047110.

The product of its digits is 48, while the sum is 15.

The square root of 21141321 is about 4597.9692256473. The cubic root of 21141321 is about 276.5099137848.

Adding to 21141321 its reverse (12314112), we get a palindrome (33455433).

The spelling of 21141321 in words is "twenty-one million, one hundred forty-one thousand, three hundred twenty-one".