21289096 has 8 divisors (see below), whose sum is σ = 39917070. Its totient is φ = 10644544.

The previous prime is 21289091. The next prime is 21289123. The reversal of 21289096 is 69098212.

It can be written as a sum of positive squares in only one way, i.e., 21288996 + 100 = 4614^2 + 10^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21289091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330561 + ... + 1330576.

Almost surely, 2^21289096 is an apocalyptic number.

It is an amenable number.

21289096 is a deficient number, since it is larger than the sum of its proper divisors (18627974).

21289096 is a wasteful number, since it uses less digits than its factorization.

21289096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661143 (or 2661139 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21289096 is about 4614.0108365716. The cubic root of 21289096 is about 277.1526742445.

The spelling of 21289096 in words is "twenty-one million, two hundred eighty-nine thousand, ninety-six".