21967384 has 16 divisors (see below), whose sum is σ = 42609600. Its totient is φ = 10604832.

The previous prime is 21967343. The next prime is 21967397. The reversal of 21967384 is 48376912.

It is a plaindrome in base 11.

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, 47112 + ... + 47575.

It is an arithmetic number, because the mean of its divisors is an integer number (2663100).

Almost surely, 2^21967384 is an apocalyptic number.

It is an amenable number.

21967384 is a deficient number, since it is larger than the sum of its proper divisors (20642216).

21967384 is a wasteful number, since it uses less digits than its factorization.

21967384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94722 (or 94718 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 21967384 is about 4686.9375929278. The cubic root of 21967384 is about 280.0653928898.

The spelling of 21967384 in words is "twenty-one million, nine hundred sixty-seven thousand, three hundred eighty-four".