21111323 has 8 divisors (see below), whose sum is σ = 21820656. Its totient is φ = 20412000.

The previous prime is 21111301. The next prime is 21111373. The reversal of 21111323 is 32311112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111323 - 2¹² = 21107227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111298 and 21111307.

It is not an unprimeable number, because it can be changed into a prime (21111373) 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, 1913 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (2727582).

Almost surely, 2^21111323 is an apocalyptic number.

21111323 is a deficient number, since it is larger than the sum of its proper divisors (709333).

21111323 is a wasteful number, since it uses less digits than its factorization.

21111323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5005.

The product of its digits is 36, while the sum is 14.

The square root of 21111323 is about 4594.7059753590. The cubic root of 21111323 is about 276.3790693798.

Adding to 21111323 its reverse (32311112), we get a palindrome (53422435).

The spelling of 21111323 in words is "twenty-one million, one hundred eleven thousand, three hundred twenty-three".