21140323 has 4 divisors (see below), whose sum is σ = 21231288. Its totient is φ = 21049360.

The previous prime is 21140303. The next prime is 21140341. The reversal of 21140323 is 32304112.

It is a happy number.

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 21140323 - 2⁵ = 21140291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140297 and 21140306.

It is not an unprimeable number, because it can be changed into a prime (21140303) 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, 45133 + ... + 45598.

It is an arithmetic number, because the mean of its divisors is an integer number (5307822).

Almost surely, 2^21140323 is an apocalyptic number.

21140323 is a deficient number, since it is larger than the sum of its proper divisors (90965).

21140323 is an equidigital number, since it uses as much as digits as its factorization.

21140323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90964.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21140323 is about 4597.8606981943. The cubic root of 21140323 is about 276.5055627285.

Adding to 21140323 its reverse (32304112), we get a palindrome (53444435).

The spelling of 21140323 in words is "twenty-one million, one hundred forty thousand, three hundred twenty-three".