21500734 has 8 divisors (see below), whose sum is σ = 32277960. Its totient is φ = 10741416.

The previous prime is 21500711. The next prime is 21500741. The reversal of 21500734 is 43700512.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (4034745).

Almost surely, 2^21500734 is an apocalyptic number.

21500734 is a deficient number, since it is larger than the sum of its proper divisors (10777226).

21500734 is a wasteful number, since it uses less digits than its factorization.

21500734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8954.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21500734 is about 4636.8883963279. Note that the first 3 decimals coincide. The cubic root of 21500734 is about 278.0680526254.

The spelling of 21500734 in words is "twenty-one million, five hundred thousand, seven hundred thirty-four".