21048170 has 64 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 6873600.

The previous prime is 21048161. The next prime is 21048173. The reversal of 21048170 is 7184012.

It is not an unprimeable number, because it can be changed into a prime (21048173) 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 31 ways as a sum of consecutive naturals, for example, 58451 + ... + 58809.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^21048170 is an apocalyptic number.

21048170 is an abundant number, since it is smaller than the sum of its proper divisors (24674710).

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

21048170 is a wasteful number, since it uses less digits than its factorization.

21048170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21048170 is about 4587.8284623556. The cubic root of 21048170 is about 276.1032047700.

The spelling of 21048170 in words is "twenty-one million, forty-eight thousand, one hundred seventy".