21107384 has 32 divisors (see below), whose sum is σ = 40465440. Its totient is φ = 10320000.

The previous prime is 21107381. The next prime is 21107393. The reversal of 21107384 is 48370112.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121922 + ... + 122094.

It is an arithmetic number, because the mean of its divisors is an integer number (1264545).

Almost surely, 2^21107384 is an apocalyptic number.

It is an amenable number.

21107384 is a deficient number, since it is larger than the sum of its proper divisors (19358056).

21107384 is a wasteful number, since it uses less digits than its factorization.

21107384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21107384 is about 4594.2773098715. The cubic root of 21107384 is about 276.3618791597.

Adding to 21107384 its reverse (48370112), we get a palindrome (69477496).

The spelling of 21107384 in words is "twenty-one million, one hundred seven thousand, three hundred eighty-four".