21352583 has 12 divisors (see below), whose sum is σ = 25641792. Its totient is φ = 17710560.

The previous prime is 21352571. The next prime is 21352601. The reversal of 21352583 is 38525312.

It is not a de Polignac number, because 21352583 - 2¹² = 21348487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352543) 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 in 11 ways as a sum of consecutive naturals, for example, 5510 + ... + 8547.

It is an arithmetic number, because the mean of its divisors is an integer number (2136816).

Almost surely, 2^21352583 is an apocalyptic number.

21352583 is a deficient number, since it is larger than the sum of its proper divisors (4289209).

21352583 is a wasteful number, since it uses less digits than its factorization.

21352583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14102 (or 14095 counting only the distinct ones).

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

The square root of 21352583 is about 4620.8855211961. The cubic root of 21352583 is about 277.4279032463.

Adding to 21352583 its reverse (38525312), we get a palindrome (59877895).

The spelling of 21352583 in words is "twenty-one million, three hundred fifty-two thousand, five hundred eighty-three".