21917096 has 8 divisors (see below), whose sum is σ = 41094570. Its totient is φ = 10958544.

The previous prime is 21917023. The next prime is 21917113. The reversal of 21917096 is 69071912.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 2292196 = 4430^2 + 1514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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, 1369811 + ... + 1369826.

Almost surely, 2^21917096 is an apocalyptic number.

It is an amenable number.

21917096 is a deficient number, since it is larger than the sum of its proper divisors (19177474).

21917096 is a wasteful number, since it uses less digits than its factorization.

21917096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739643 (or 2739639 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 21917096 is about 4681.5698221857. The cubic root of 21917096 is about 279.8515199165.

The spelling of 21917096 in words is "twenty-one million, nine hundred seventeen thousand, ninety-six".