21383410 has 16 divisors (see below), whose sum is σ = 39531096. Its totient is φ = 8322048.

The previous prime is 21383393. The next prime is 21383413. The reversal of 21383410 is 1438312.

It can be written as a sum of positive squares in 4 ways, for example, as 21132409 + 251001 = 4597^2 + 501^2 .

It is not an unprimeable number, because it can be changed into a prime (21383413) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28527 + ... + 29266.

Almost surely, 2^21383410 is an apocalyptic number.

21383410 is a deficient number, since it is larger than the sum of its proper divisors (18147686).

21383410 is a wasteful number, since it uses less digits than its factorization.

21383410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57837.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21383410 is about 4624.2199342159. The cubic root of 21383410 is about 277.5613477980.

The spelling of 21383410 in words is "twenty-one million, three hundred eighty-three thousand, four hundred ten".