21049276 has 6 divisors (see below), whose sum is σ = 36836240. Its totient is φ = 10524636.

The previous prime is 21049271. The next prime is 21049289. The reversal of 21049276 is 67294012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21049271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631156 + ... + 2631163.

Almost surely, 2^21049276 is an apocalyptic number.

It is an amenable number.

21049276 is a deficient number, since it is larger than the sum of its proper divisors (15786964).

21049276 is a wasteful number, since it uses less digits than its factorization.

21049276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5262323 (or 5262321 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21049276 is about 4587.9489971010. The cubic root of 21049276 is about 276.1080407375.

The spelling of 21049276 in words is "twenty-one million, forty-nine thousand, two hundred seventy-six".