21633734 has 8 divisors (see below), whose sum is σ = 32470848. Its totient is φ = 10810120.

The previous prime is 21633719. The next prime is 21633743. The reversal of 21633734 is 43733612.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21633697 and 21633706.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3179 + ... + 7305.

It is an arithmetic number, because the mean of its divisors is an integer number (4058856).

Almost surely, 2^21633734 is an apocalyptic number.

21633734 is a deficient number, since it is larger than the sum of its proper divisors (10837114).

21633734 is a wasteful number, since it uses less digits than its factorization.

21633734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750.

The product of its digits is 9072, while the sum is 29.

The square root of 21633734 is about 4651.2078001311. The cubic root of 21633734 is about 278.6402354939.

The spelling of 21633734 in words is "twenty-one million, six hundred thirty-three thousand, seven hundred thirty-four".