21120323 has 24 divisors (see below), whose sum is σ = 25855200. Its totient is φ = 17179008.

The previous prime is 21120317. The next prime is 21120349. The reversal of 21120323 is 32302112.

It is a happy number.

It is not a de Polignac number, because 21120323 - 2⁶ = 21120259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120298 and 21120307.

It is not an unprimeable number, because it can be changed into a prime (21120383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126386 + ... + 126552.

It is an arithmetic number, because the mean of its divisors is an integer number (1077300).

Almost surely, 2^21120323 is an apocalyptic number.

21120323 is a deficient number, since it is larger than the sum of its proper divisors (4734877).

21120323 is a wasteful number, since it uses less digits than its factorization.

21120323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21120323 is about 4595.6852590229. The cubic root of 21120323 is about 276.4183383263.

Adding to 21120323 its reverse (32302112), we get a palindrome (53422435).

The spelling of 21120323 in words is "twenty-one million, one hundred twenty thousand, three hundred twenty-three".