21566096 has 10 divisors (see below), whose sum is σ = 41784342. Its totient is φ = 10783040.

The previous prime is 21566089. The next prime is 21566101. The reversal of 21566096 is 69066512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14167696 + 7398400 = 3764^2 + 2720^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673925 + ... + 673956.

Almost surely, 2^21566096 is an apocalyptic number.

It is an amenable number.

21566096 is a deficient number, since it is larger than the sum of its proper divisors (20218246).

21566096 is a wasteful number, since it uses less digits than its factorization.

21566096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347889 (or 1347883 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 21566096 is about 4643.9310933734. The cubic root of 21566096 is about 278.3495422053.

The spelling of 21566096 in words is "twenty-one million, five hundred sixty-six thousand, ninety-six".