21795633 has 6 divisors (see below), whose sum is σ = 31482594. Its totient is φ = 14530416.

The previous prime is 21795629. The next prime is 21795637. The reversal of 21795633 is 33659712.

21795633 is a `hidden beast` number, since 2 + 17 + 9 + 5 + 633 = 666.

It is an interprime number because it is at equal distance from previous prime (21795629) and next prime (21795637).

It can be written as a sum of positive squares in only one way, i.e., 12723489 + 9072144 = 3567^2 + 3012^2 .

It is not a de Polignac number, because 21795633 - 2² = 21795629 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21795637) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1210860 + ... + 1210877.

It is an arithmetic number, because the mean of its divisors is an integer number (5247099).

Almost surely, 2^21795633 is an apocalyptic number.

It is an amenable number.

21795633 is a deficient number, since it is larger than the sum of its proper divisors (9686961).

21795633 is a wasteful number, since it uses less digits than its factorization.

21795633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421743 (or 2421740 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21795633 is about 4668.5793342301. The cubic root of 21795633 is about 279.3335894960. Note that the first 3 decimals are identical.

The spelling of 21795633 in words is "twenty-one million, seven hundred ninety-five thousand, six hundred thirty-three".