21379576 has 16 divisors (see below), whose sum is σ = 40501440. Its totient is φ = 10579200.

The previous prime is 21379571. The next prime is 21379609. The reversal of 21379576 is 67597312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13000 + ... + 14551.

It is an arithmetic number, because the mean of its divisors is an integer number (2531340).

Almost surely, 2^21379576 is an apocalyptic number.

It is an amenable number.

21379576 is a deficient number, since it is larger than the sum of its proper divisors (19121864).

21379576 is a wasteful number, since it uses less digits than its factorization.

21379576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27654 (or 27650 counting only the distinct ones).

The product of its digits is 79380, while the sum is 40.

The square root of 21379576 is about 4623.8053592252. The cubic root of 21379576 is about 277.5447580864.

The spelling of 21379576 in words is "twenty-one million, three hundred seventy-nine thousand, five hundred seventy-six".