21709796 has 12 divisors (see below), whose sum is σ = 39217920. Its totient is φ = 10504680.

The previous prime is 21709781. The next prime is 21709813. The reversal of 21709796 is 69790712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87416 + ... + 87663.

It is an arithmetic number, because the mean of its divisors is an integer number (3268160).

Almost surely, 2^21709796 is an apocalyptic number.

It is an amenable number.

21709796 is a deficient number, since it is larger than the sum of its proper divisors (17508124).

21709796 is a wasteful number, since it uses less digits than its factorization.

21709796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175114 (or 175112 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 21709796 is about 4659.3772116024. The cubic root of 21709796 is about 278.9664103993.

The spelling of 21709796 in words is "twenty-one million, seven hundred nine thousand, seven hundred ninety-six".