21459734 has 4 divisors (see below), whose sum is σ = 32189604. Its totient is φ = 10729866.

The previous prime is 21459731. The next prime is 21459743. The reversal of 21459734 is 43795412.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21459694 and 21459703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21459731) 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 as a sum of consecutive naturals, namely, 5364932 + ... + 5364935.

It is an arithmetic number, because the mean of its divisors is an integer number (8047401).

Almost surely, 2^21459734 is an apocalyptic number.

21459734 is a deficient number, since it is larger than the sum of its proper divisors (10729870).

21459734 is a wasteful number, since it uses less digits than its factorization.

21459734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10729869.

The product of its digits is 30240, while the sum is 35.

The square root of 21459734 is about 4632.4652184339. The cubic root of 21459734 is about 277.8911897547.

The spelling of 21459734 in words is "twenty-one million, four hundred fifty-nine thousand, seven hundred thirty-four".