21900633 has 16 divisors (see below), whose sum is σ = 30176256. Its totient is φ = 14117760.

The previous prime is 21900583. The next prime is 21900649. The reversal of 21900633 is 33600912.

It is not a de Polignac number, because 21900633 - 2⁸ = 21900377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21900433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20685 + ... + 21717.

It is an arithmetic number, because the mean of its divisors is an integer number (1886016).

Almost surely, 2^21900633 is an apocalyptic number.

It is an amenable number.

21900633 is a deficient number, since it is larger than the sum of its proper divisors (8275623).

21900633 is a wasteful number, since it uses less digits than its factorization.

21900633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 21900633 is about 4679.8112141410. The cubic root of 21900633 is about 279.7814323219.

The spelling of 21900633 in words is "twenty-one million, nine hundred thousand, six hundred thirty-three".