21433633 has 8 divisors (see below), whose sum is σ = 23146088. Its totient is φ = 19730304.

The previous prime is 21433613. The next prime is 21433649. The reversal of 21433633 is 33633412.

It can be written as a sum of positive squares in 4 ways, for example, as 61504 + 21372129 = 248^2 + 4623^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21433633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21433598 and 21433607.

It is not an unprimeable number, because it can be changed into a prime (21433613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3085 + ... + 7237.

It is an arithmetic number, because the mean of its divisors is an integer number (2893261).

Almost surely, 2^21433633 is an apocalyptic number.

It is an amenable number.

21433633 is a deficient number, since it is larger than the sum of its proper divisors (1712455).

21433633 is a wasteful number, since it uses less digits than its factorization.

21433633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563.

The product of its digits is 3888, while the sum is 25.

The square root of 21433633 is about 4629.6471787816. The cubic root of 21433633 is about 277.7784797434.

It can be divided in two parts, 214336 and 33, that added together give a square (214369 = 463²).

The spelling of 21433633 in words is "twenty-one million, four hundred thirty-three thousand, six hundred thirty-three".