21217614 has 32 divisors (see below), whose sum is σ = 46621440. Its totient is φ = 6384000.

The previous prime is 21217597. The next prime is 21217621. The reversal of 21217614 is 41671212.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8902 + ... + 11030.

It is an arithmetic number, because the mean of its divisors is an integer number (1456920).

Almost surely, 2^21217614 is an apocalyptic number.

21217614 is an abundant number, since it is smaller than the sum of its proper divisors (25403826).

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

21217614 is a wasteful number, since it uses less digits than its factorization.

21217614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296.

The product of its digits is 672, while the sum is 24.

The square root of 21217614 is about 4606.2581343212. The cubic root of 21217614 is about 276.8421296289.

Adding to 21217614 its reverse (41671212), we get a palindrome (62888826).

The spelling of 21217614 in words is "twenty-one million, two hundred seventeen thousand, six hundred fourteen".