21697833 has 16 divisors (see below), whose sum is σ = 29465856. Its totient is φ = 14200320.

The previous prime is 21697811. The next prime is 21697847. The reversal of 21697833 is 33879612.

It is not a de Polignac number, because 21697833 - 2⁵ = 21697801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21697791 and 21697800.

It is not an unprimeable number, because it can be changed into a prime (21697853) 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 15 ways as a sum of consecutive naturals, for example, 50128 + ... + 50558.

It is an arithmetic number, because the mean of its divisors is an integer number (1841616).

Almost surely, 2^21697833 is an apocalyptic number.

It is an amenable number.

21697833 is a deficient number, since it is larger than the sum of its proper divisors (7768023).

21697833 is a wasteful number, since it uses less digits than its factorization.

21697833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its digits is 54432, while the sum is 39.

The square root of 21697833 is about 4658.0932794439. The cubic root of 21697833 is about 278.9151602886.

The spelling of 21697833 in words is "twenty-one million, six hundred ninety-seven thousand, eight hundred thirty-three".