21710764 has 12 divisors (see below), whose sum is σ = 38064600. Its totient is φ = 10835168.

The previous prime is 21710753. The next prime is 21710783. The reversal of 21710764 is 46701712.

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 in 3 ways as a sum of consecutive naturals, for example, 2494 + ... + 7045.

It is an arithmetic number, because the mean of its divisors is an integer number (3172050).

Almost surely, 2^21710764 is an apocalyptic number.

It is an amenable number.

21710764 is a deficient number, since it is larger than the sum of its proper divisors (16353836).

21710764 is a wasteful number, since it uses less digits than its factorization.

21710764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10112 (or 10110 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21710764 is about 4659.4810869881. The cubic root of 21710764 is about 278.9705565380.

The spelling of 21710764 in words is "twenty-one million, seven hundred ten thousand, seven hundred sixty-four".