21532383 has 24 divisors (see below), whose sum is σ = 32587776. Its totient is φ = 13683600.

The previous prime is 21532373. The next prime is 21532403. The reversal of 21532383 is 38323512.

It is not a de Polignac number, because 21532383 - 2⁹ = 21531871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532333) 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, 19266 + ... + 20352.

It is an arithmetic number, because the mean of its divisors is an integer number (1357824).

Almost surely, 2^21532383 is an apocalyptic number.

21532383 is a deficient number, since it is larger than the sum of its proper divisors (11055393).

21532383 is a wasteful number, since it uses less digits than its factorization.

21532383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1192 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 21532383 is about 4640.2998825507. The cubic root of 21532383 is about 278.2044241121.

Adding to 21532383 its reverse (38323512), we get a palindrome (59855895).

The spelling of 21532383 in words is "twenty-one million, five hundred thirty-two thousand, three hundred eighty-three".