21601383 has 8 divisors (see below), whose sum is σ = 29504496. Its totient is φ = 14049600.

The previous prime is 21601367. The next prime is 21601397. The reversal of 21601383 is 38310612.

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

It is not a de Polignac number, because 21601383 - 2⁴ = 21601367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87688 + ... + 87933.

It is an arithmetic number, because the mean of its divisors is an integer number (3688062).

Almost surely, 2^21601383 is an apocalyptic number.

21601383 is a deficient number, since it is larger than the sum of its proper divisors (7903113).

21601383 is a wasteful number, since it uses less digits than its factorization.

21601383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175665.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21601383 is about 4647.7288001776. The cubic root of 21601383 is about 278.5012737023.

Adding to 21601383 its reverse (38310612), we get a palindrome (59911995).

The spelling of 21601383 in words is "twenty-one million, six hundred one thousand, three hundred eighty-three".