21141323 has 4 divisors (see below), whose sum is σ = 24161520. Its totient is φ = 18121128.

The previous prime is 21141317. The next prime is 21141361. The reversal of 21141323 is 32314112.

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

It is a cyclic number.

It is not a de Polignac number, because 21141323 - 2⁶ = 21141259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141383) 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, 1510088 + ... + 1510101.

It is an arithmetic number, because the mean of its divisors is an integer number (6040380).

Almost surely, 2^21141323 is an apocalyptic number.

21141323 is a deficient number, since it is larger than the sum of its proper divisors (3020197).

21141323 is an equidigital number, since it uses as much as digits as its factorization.

21141323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020196.

The product of its digits is 144, while the sum is 17.

The square root of 21141323 is about 4597.9694431347. The cubic root of 21141323 is about 276.5099225043.

Adding to 21141323 its reverse (32314112), we get a palindrome (53455435).

The spelling of 21141323 in words is "twenty-one million, one hundred forty-one thousand, three hundred twenty-three".