21019832 has 8 divisors (see below), whose sum is σ = 39412200. Its totient is φ = 10509912.

The previous prime is 21019799. The next prime is 21019841. The reversal of 21019832 is 23891012.

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

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 as a sum of consecutive naturals, namely, 1313732 + ... + 1313747.

It is an arithmetic number, because the mean of its divisors is an integer number (4926525).

Almost surely, 2^21019832 is an apocalyptic number.

It is an amenable number.

21019832 is a deficient number, since it is larger than the sum of its proper divisors (18392368).

21019832 is a wasteful number, since it uses less digits than its factorization.

21019832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627485 (or 2627481 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21019832 is about 4584.7390329222. The cubic root of 21019832 is about 275.9792394943.

The spelling of 21019832 in words is "twenty-one million, nineteen thousand, eight hundred thirty-two".