21965066 has 8 divisors (see below), whose sum is σ = 32970564. Its totient is φ = 10974880.

The previous prime is 21965039. The next prime is 21965077. The reversal of 21965066 is 66056912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21022225 + 942841 = 4585^2 + 971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956 + ... + 6696.

Almost surely, 2^21965066 is an apocalyptic number.

21965066 is a deficient number, since it is larger than the sum of its proper divisors (11005498).

21965066 is a wasteful number, since it uses less digits than its factorization.

21965066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7656.

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

The square root of 21965066 is about 4686.6903034018. The cubic root of 21965066 is about 280.0555417029.

The spelling of 21965066 in words is "twenty-one million, nine hundred sixty-five thousand, sixty-six".