21425734 has 8 divisors (see below), whose sum is σ = 35060328. Its totient is φ = 9738960.

The previous prime is 21425707. The next prime is 21425759. The reversal of 21425734 is 43752412.

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

It is a congruent number.

It is an unprimeable number.

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, 486927 + ... + 486970.

It is an arithmetic number, because the mean of its divisors is an integer number (4382541).

Almost surely, 2^21425734 is an apocalyptic number.

21425734 is a deficient number, since it is larger than the sum of its proper divisors (13634594).

21425734 is a wasteful number, since it uses less digits than its factorization.

21425734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973910.

The product of its digits is 6720, while the sum is 28.

The square root of 21425734 is about 4628.7940114030. The cubic root of 21425734 is about 277.7443520431.

The spelling of 21425734 in words is "twenty-one million, four hundred twenty-five thousand, seven hundred thirty-four".