21552383 has 2 divisors, whose sum is σ = 21552384. Its totient is φ = 21552382.

The previous prime is 21552373. The next prime is 21552437. The reversal of 21552383 is 38325512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21552383 - 2⁶ = 21552319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21552353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776191 + 10776192.

It is an arithmetic number, because the mean of its divisors is an integer number (10776192).

Almost surely, 2^21552383 is an apocalyptic number.

21552383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21552383 is an equidigital number, since it uses as much as digits as its factorization.

21552383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 21552383 is about 4642.4544155005. The cubic root of 21552383 is about 278.2905326595.

Adding to 21552383 its reverse (38325512), we get a palindrome (59877895).

The spelling of 21552383 in words is "twenty-one million, five hundred fifty-two thousand, three hundred eighty-three".