21438703 has 8 divisors (see below), whose sum is σ = 25186896. Its totient is φ = 17990400.

The previous prime is 21438689. The next prime is 21438733. The reversal of 21438703 is 30783412.

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-21438703 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438733) 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 7 ways as a sum of consecutive naturals, for example, 74818 + ... + 75103.

It is an arithmetic number, because the mean of its divisors is an integer number (3148362).

Almost surely, 2^21438703 is an apocalyptic number.

21438703 is a deficient number, since it is larger than the sum of its proper divisors (3748193).

21438703 is a wasteful number, since it uses less digits than its factorization.

21438703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149945.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21438703 is about 4630.1947043294. The cubic root of 21438703 is about 277.8003803060.

The spelling of 21438703 in words is "twenty-one million, four hundred thirty-eight thousand, seven hundred three".