21040276 has 12 divisors (see below), whose sum is σ = 36854272. Its totient is φ = 10510488.

The previous prime is 21040267. The next prime is 21040297. The reversal of 21040276 is 67204012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5071 + ... + 8233.

Almost surely, 2^21040276 is an apocalyptic number.

It is an amenable number.

21040276 is a deficient number, since it is larger than the sum of its proper divisors (15813996).

21040276 is a wasteful number, since it uses less digits than its factorization.

21040276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830 (or 4828 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21040276 is about 4586.9680618029. The cubic root of 21040276 is about 276.0686834596.

Adding to 21040276 its reverse (67204012), we get a palindrome (88244288).

It can be divided in two parts, 21040 and 276, that added together give a square (21316 = 146²).

The spelling of 21040276 in words is "twenty-one million, forty thousand, two hundred seventy-six".