21485734 has 8 divisors (see below), whose sum is σ = 32252400. Its totient is φ = 10734936.

The previous prime is 21485731. The next prime is 21485741. The reversal of 21485734 is 43758412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21485734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485731) 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 3 ways as a sum of consecutive naturals, for example, 367 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (4031550).

Almost surely, 2^21485734 is an apocalyptic number.

21485734 is a deficient number, since it is larger than the sum of its proper divisors (10766666).

21485734 is a wasteful number, since it uses less digits than its factorization.

21485734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7934.

The product of its digits is 26880, while the sum is 34.

The square root of 21485734 is about 4635.2706501347. The cubic root of 21485734 is about 278.0033728004.

The spelling of 21485734 in words is "twenty-one million, four hundred eighty-five thousand, seven hundred thirty-four".