21030376 has 32 divisors (see below), whose sum is σ = 40871880. Its totient is φ = 10137600.

The previous prime is 21030337. The next prime is 21030379. The reversal of 21030376 is 67303012.

It can be written as a sum of positive squares in 4 ways, for example, as 15413476 + 5616900 = 3926^2 + 2370^2 .

It is not an unprimeable number, because it can be changed into a prime (21030379) 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, 31486 + ... + 32146.

Almost surely, 2^21030376 is an apocalyptic number.

It is an amenable number.

21030376 is a deficient number, since it is larger than the sum of its proper divisors (19841504).

21030376 is a wasteful number, since it uses less digits than its factorization.

21030376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 21030376 is about 4585.8887906272. Note that the first 3 decimals coincide. The cubic root of 21030376 is about 276.0253774887.

Adding to 21030376 its reverse (67303012), we get a palindrome (88333388).

The spelling of 21030376 in words is "twenty-one million, thirty thousand, three hundred seventy-six".