21153323 has 2 divisors, whose sum is σ = 21153324. Its totient is φ = 21153322.

The previous prime is 21153299. The next prime is 21153347. The reversal of 21153323 is 32335112.

It is a balanced prime because it is at equal distance from previous prime (21153299) and next prime (21153347).

It is a cyclic number.

It is not a de Polignac number, because 21153323 - 2⁶ = 21153259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21153295 and 21153304.

It is not a weakly prime, because it can be changed into another prime (21153373) 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 as a sum of consecutive naturals, namely, 10576661 + 10576662.

It is an arithmetic number, because the mean of its divisors is an integer number (10576662).

Almost surely, 2^21153323 is an apocalyptic number.

21153323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153323 is an equidigital number, since it uses as much as digits as its factorization.

21153323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 20.

The square root of 21153323 is about 4599.2741818683. The cubic root of 21153323 is about 276.5622290931.

Adding to 21153323 its reverse (32335112), we get a palindrome (53488435).

The spelling of 21153323 in words is "twenty-one million, one hundred fifty-three thousand, three hundred twenty-three".