21071168 has 28 divisors (see below), whose sum is σ = 43258740. Its totient is φ = 10171392.

The previous prime is 21071137. The next prime is 21071179. The reversal of 21071168 is 86117012.

It can be written as a sum of positive squares in 2 ways, for example, as 8340544 + 12730624 = 2888^2 + 3568^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3821 + ... + 7532.

It is an arithmetic number, because the mean of its divisors is an integer number (1544955).

Almost surely, 2^21071168 is an apocalyptic number.

It is an amenable number.

21071168 is an abundant number, since it is smaller than the sum of its proper divisors (22187572).

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

21071168 is a wasteful number, since it uses less digits than its factorization.

21071168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11394 (or 11384 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 21071168 is about 4590.3341926269. The cubic root of 21071168 is about 276.2037283187.

The spelling of 21071168 in words is "twenty-one million, seventy-one thousand, one hundred sixty-eight".