21004323 has 8 divisors (see below), whose sum is σ = 28971600. Its totient is φ = 13519968.

The previous prime is 21004309. The next prime is 21004331. The reversal of 21004323 is 32340012.

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

It is not a de Polignac number, because 21004323 - 2⁹ = 21003811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21004303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120628 + ... + 120801.

It is an arithmetic number, because the mean of its divisors is an integer number (3621450).

Almost surely, 2^21004323 is an apocalyptic number.

21004323 is a deficient number, since it is larger than the sum of its proper divisors (7967277).

21004323 is a wasteful number, since it uses less digits than its factorization.

21004323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241461.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21004323 is about 4583.0473486535. The cubic root of 21004323 is about 275.9113478141.

Adding to 21004323 its reverse (32340012), we get a palindrome (53344335).

The spelling of 21004323 in words is "twenty-one million, four thousand, three hundred twenty-three".