21495066 has 16 divisors (see below), whose sum is σ = 43140384. Its totient is φ = 7139984.

The previous prime is 21495053. The next prime is 21495079. The reversal of 21495066 is 66059412.

It is an interprime number because it is at equal distance from previous prime (21495053) and next prime (21495079).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4356 + ... + 7871.

It is an arithmetic number, because the mean of its divisors is an integer number (2696274).

Almost surely, 2^21495066 is an apocalyptic number.

21495066 is an abundant number, since it is smaller than the sum of its proper divisors (21645318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21495066 is a wasteful number, since it uses less digits than its factorization.

21495066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12525.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21495066 is about 4636.2771703167. The cubic root of 21495066 is about 278.0436158125.

The spelling of 21495066 in words is "twenty-one million, four hundred ninety-five thousand, sixty-six".