21162716 has 6 divisors (see below), whose sum is σ = 37034760. Its totient is φ = 10581356.

The previous prime is 21162709. The next prime is 21162727. The reversal of 21162716 is 61726112.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2645336 + ... + 2645343.

It is an arithmetic number, because the mean of its divisors is an integer number (6172460).

Almost surely, 2^21162716 is an apocalyptic number.

It is an amenable number.

21162716 is a deficient number, since it is larger than the sum of its proper divisors (15872044).

21162716 is a wasteful number, since it uses less digits than its factorization.

21162716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290683 (or 5290681 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 21162716 is about 4600.2952079187. The cubic root of 21162716 is about 276.6031582749.

Adding to 21162716 its reverse (61726112), we get a palindrome (82888828).

The spelling of 21162716 in words is "twenty-one million, one hundred sixty-two thousand, seven hundred sixteen".