21171896 has 16 divisors (see below), whose sum is σ = 39791040. Its totient is φ = 10560960.

The previous prime is 21171883. The next prime is 21171911. The reversal of 21171896 is 69817112.

It is a congruent number.

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, 761 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (2486940).

Almost surely, 2^21171896 is an apocalyptic number.

It is an amenable number.

21171896 is a deficient number, since it is larger than the sum of its proper divisors (18619144).

21171896 is a wasteful number, since it uses less digits than its factorization.

21171896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6254 (or 6250 counting only the distinct ones).

The product of its digits is 6048, while the sum is 35.

The square root of 21171896 is about 4601.2928617944. The cubic root of 21171896 is about 276.6431476274.

The spelling of 21171896 in words is "twenty-one million, one hundred seventy-one thousand, eight hundred ninety-six".