21893512 has 8 divisors (see below), whose sum is σ = 41050350. Its totient is φ = 10946752.

The previous prime is 21893483. The next prime is 21893513. The reversal of 21893512 is 21539812.

It can be written as a sum of positive squares in only one way, i.e., 13793796 + 8099716 = 3714^2 + 2846^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1368337 + ... + 1368352.

Almost surely, 2^21893512 is an apocalyptic number.

It is an amenable number.

21893512 is a deficient number, since it is larger than the sum of its proper divisors (19156838).

21893512 is a wasteful number, since it uses less digits than its factorization.

21893512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736695 (or 2736691 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 21893512 is about 4679.0503309967. The cubic root of 21893512 is about 279.7511053514.

The spelling of 21893512 in words is "twenty-one million, eight hundred ninety-three thousand, five hundred twelve".