21331614 has 8 divisors (see below), whose sum is σ = 42663240. Its totient is φ = 7110536.

The previous prime is 21331589. The next prime is 21331621. The reversal of 21331614 is 41613312.

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

21331614 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777629 + ... + 1777640.

It is an arithmetic number, because the mean of its divisors is an integer number (5332905).

Almost surely, 2^21331614 is an apocalyptic number.

21331614 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21331614 is a wasteful number, since it uses less digits than its factorization.

21331614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555274.

The product of its digits is 432, while the sum is 21.

The square root of 21331614 is about 4618.6160264737. The cubic root of 21331614 is about 277.3370587954.

Adding to 21331614 its reverse (41613312), we get a palindrome (62944926).

It can be divided in two parts, 21331 and 614, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 21331614 in words is "twenty-one million, three hundred thirty-one thousand, six hundred fourteen".