21601382 has 16 divisors (see below), whose sum is σ = 35471952. Its totient is φ = 9784320.

The previous prime is 21601367. The next prime is 21601397. The reversal of 21601382 is 28310612.

21601382 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (21601367) and next prime (21601397).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5318 + ... + 8454.

It is an arithmetic number, because the mean of its divisors is an integer number (2216997).

Almost surely, 2^21601382 is an apocalyptic number.

21601382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21601382 is a deficient number, since it is larger than the sum of its proper divisors (13870570).

21601382 is a wasteful number, since it uses less digits than its factorization.

21601382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21601382 is about 4647.7286925981. The cubic root of 21601382 is about 278.5012694047.

Adding to 21601382 its reverse (28310612), we get a palindrome (49911994).

The spelling of 21601382 in words is "twenty-one million, six hundred one thousand, three hundred eighty-two".