21955833 has 32 divisors (see below), whose sum is σ = 33782400. Its totient is φ = 14084928.

The previous prime is 21955831. The next prime is 21955841. The reversal of 21955833 is 33855912.

It is not a de Polignac number, because 21955833 - 2¹ = 21955831 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21955831) 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 31 ways as a sum of consecutive naturals, for example, 95763 + ... + 95991.

It is an arithmetic number, because the mean of its divisors is an integer number (1055700).

Almost surely, 2^21955833 is an apocalyptic number.

It is an amenable number.

21955833 is a deficient number, since it is larger than the sum of its proper divisors (11826567).

21955833 is a wasteful number, since it uses less digits than its factorization.

21955833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 352 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 21955833 is about 4685.7051763849. The cubic root of 21955833 is about 280.0162958203.

The spelling of 21955833 in words is "twenty-one million, nine hundred fifty-five thousand, eight hundred thirty-three".