21103734 has 8 divisors (see below), whose sum is σ = 42207480. Its totient is φ = 7034576.

The previous prime is 21103729. The next prime is 21103741. The reversal of 21103734 is 43730112.

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

21103734 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758639 + ... + 1758650.

It is an arithmetic number, because the mean of its divisors is an integer number (5275935).

Almost surely, 2^21103734 is an apocalyptic number.

21103734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103734 is a wasteful number, since it uses less digits than its factorization.

21103734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517294.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21103734 is about 4593.8800593834. The cubic root of 21103734 is about 276.3459482575.

Adding to 21103734 its reverse (43730112), we get a palindrome (64833846).

The spelling of 21103734 in words is "twenty-one million, one hundred three thousand, seven hundred thirty-four".