21648070 has 8 divisors (see below), whose sum is σ = 38966544. Its totient is φ = 8659224.

The previous prime is 21648047. The next prime is 21648079. The reversal of 21648070 is 7084612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21648079) by changing a digit.

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, 1082394 + ... + 1082413.

It is an arithmetic number, because the mean of its divisors is an integer number (4870818).

Almost surely, 2^21648070 is an apocalyptic number.

21648070 is a deficient number, since it is larger than the sum of its proper divisors (17318474).

21648070 is a wasteful number, since it uses less digits than its factorization.

21648070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164814.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21648070 is about 4652.7486499917. The cubic root of 21648070 is about 278.7017706312.

It can be divided in two parts, 21 and 648070, that added together give a triangular number (648091 = T₁₁₃₈).

The spelling of 21648070 in words is "twenty-one million, six hundred forty-eight thousand, seventy".