21071848 has 16 divisors (see below), whose sum is σ = 45154080. Its totient is φ = 9030768.

The previous prime is 21071837. The next prime is 21071851. The reversal of 21071848 is 84817012.

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, 188086 + ... + 188197.

It is an arithmetic number, because the mean of its divisors is an integer number (2822130).

Almost surely, 2^21071848 is an apocalyptic number.

21071848 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21071848 is an abundant number, since it is smaller than the sum of its proper divisors (24082232).

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

21071848 is a wasteful number, since it uses less digits than its factorization.

21071848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376296 (or 376292 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 21071848 is about 4590.4082607106. The cubic root of 21071848 is about 276.2066994642.

The spelling of 21071848 in words is "twenty-one million, seventy-one thousand, eight hundred forty-eight".