21023276 has 6 divisors (see below), whose sum is σ = 36790740. Its totient is φ = 10511636.

The previous prime is 21023269. The next prime is 21023279. The reversal of 21023276 is 67232012.

It is not an unprimeable number, because it can be changed into a prime (21023279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627906 + ... + 2627913.

It is an arithmetic number, because the mean of its divisors is an integer number (6131790).

Almost surely, 2^21023276 is an apocalyptic number.

It is an amenable number.

21023276 is a deficient number, since it is larger than the sum of its proper divisors (15767464).

21023276 is a wasteful number, since it uses less digits than its factorization.

21023276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255823 (or 5255821 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21023276 is about 4585.1146114356. The cubic root of 21023276 is about 275.9943113019.

Adding to 21023276 its reverse (67232012), we get a palindrome (88255288).

The spelling of 21023276 in words is "twenty-one million, twenty-three thousand, two hundred seventy-six".