21290876 has 12 divisors (see below), whose sum is σ = 37291800. Its totient is φ = 10636080.

The previous prime is 21290839. The next prime is 21290903. The reversal of 21290876 is 67809212.

It is a happy number.

It is a super-3 number, since 3×21290876³ (a number of 23 digits) contains 333 as substring.

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, 6431 + ... + 9161.

It is an arithmetic number, because the mean of its divisors is an integer number (3107650).

Almost surely, 2^21290876 is an apocalyptic number.

It is an amenable number.

21290876 is a deficient number, since it is larger than the sum of its proper divisors (16000924).

21290876 is a wasteful number, since it uses less digits than its factorization.

21290876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684 (or 4682 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 21290876 is about 4614.2037232875. The cubic root of 21290876 is about 277.1603983553.

The spelling of 21290876 in words is "twenty-one million, two hundred ninety thousand, eight hundred seventy-six".