21767716 has 12 divisors (see below), whose sum is σ = 38142832. Its totient is φ = 10869768.

The previous prime is 21767693. The next prime is 21767717. The reversal of 21767716 is 61776712.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21767717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451 + ... + 6613.

Almost surely, 2^21767716 is an apocalyptic number.

It is an amenable number.

21767716 is a deficient number, since it is larger than the sum of its proper divisors (16375116).

21767716 is a wasteful number, since it uses less digits than its factorization.

21767716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050 (or 7048 counting only the distinct ones).

The product of its digits is 24696, while the sum is 37.

The square root of 21767716 is about 4665.5884944988. The cubic root of 21767716 is about 279.2142767937.

The spelling of 21767716 in words is "twenty-one million, seven hundred sixty-seven thousand, seven hundred sixteen".