21248070 has 16 divisors (see below), whose sum is σ = 50995440. Its totient is φ = 5666144.

The previous prime is 21248057. The next prime is 21248081. The reversal of 21248070 is 7084212.

It is a self number, because there is not a number n which added to its sum of digits gives 21248070.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354105 + ... + 354164.

It is an arithmetic number, because the mean of its divisors is an integer number (3187215).

Almost surely, 2^21248070 is an apocalyptic number.

21248070 is an abundant number, since it is smaller than the sum of its proper divisors (29747370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21248070 is a wasteful number, since it uses less digits than its factorization.

21248070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708279.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21248070 is about 4609.5628860012. The cubic root of 21248070 is about 276.9745270619.

The spelling of 21248070 in words is "twenty-one million, two hundred forty-eight thousand, seventy".