21760716 has 24 divisors (see below), whose sum is σ = 51472624. Its totient is φ = 7153920.

The previous prime is 21760679. The next prime is 21760727. The reversal of 21760716 is 61706712.

It is a happy 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, 11545 + ... + 13296.

Almost surely, 2^21760716 is an apocalyptic number.

It is an amenable number.

21760716 is an abundant number, since it is smaller than the sum of its proper divisors (29711908).

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

21760716 is a wasteful number, since it uses less digits than its factorization.

21760716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24921 (or 24919 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21760716 is about 4664.8382608618. The cubic root of 21760716 is about 279.1843439414.

The spelling of 21760716 in words is "twenty-one million, seven hundred sixty thousand, seven hundred sixteen".