21436833 has 16 divisors (see below), whose sum is σ = 31908096. Its totient is φ = 12689040.

The previous prime is 21436823. The next prime is 21436843. The reversal of 21436833 is 33863412.

It is an interprime number because it is at equal distance from previous prime (21436823) and next prime (21436843).

It is not a de Polignac number, because 21436833 - 2¹² = 21432737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21436833.

It is not an unprimeable number, because it can be changed into a prime (21436823) 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, 6135 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (1994256).

Almost surely, 2^21436833 is an apocalyptic number.

It is an amenable number.

21436833 is a deficient number, since it is larger than the sum of its proper divisors (10471263).

21436833 is a wasteful number, since it uses less digits than its factorization.

21436833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15164.

The product of its digits is 10368, while the sum is 30.

The square root of 21436833 is about 4629.9927645732. The cubic root of 21436833 is about 277.7923029856.

The spelling of 21436833 in words is "twenty-one million, four hundred thirty-six thousand, eight hundred thirty-three".