21323953 has 8 divisors (see below), whose sum is σ = 24770240. Its totient is φ = 17977680.

The previous prime is 21323941. The next prime is 21323959. The reversal of 21323953 is 35932312.

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

It is not a de Polignac number, because 21323953 - 2⁹ = 21323441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323959) 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, 24543 + ... + 25396.

It is an arithmetic number, because the mean of its divisors is an integer number (3096280).

Almost surely, 2^21323953 is an apocalyptic number.

It is an amenable number.

21323953 is a deficient number, since it is larger than the sum of its proper divisors (3446287).

21323953 is an equidigital number, since it uses as much as digits as its factorization.

21323953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50007.

The product of its digits is 4860, while the sum is 28.

The square root of 21323953 is about 4617.7865909979. The cubic root of 21323953 is about 277.3038540316.

The spelling of 21323953 in words is "twenty-one million, three hundred twenty-three thousand, nine hundred fifty-three".