21790876 has 6 divisors (see below), whose sum is σ = 38134040. Its totient is φ = 10895436.

The previous prime is 21790843. The next prime is 21790921. The reversal of 21790876 is 67809712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2723856 + ... + 2723863.

Almost surely, 2^21790876 is an apocalyptic number.

It is an amenable number.

21790876 is a deficient number, since it is larger than the sum of its proper divisors (16343164).

21790876 is a wasteful number, since it uses less digits than its factorization.

21790876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5447723 (or 5447721 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 21790876 is about 4668.0698366670. The cubic root of 21790876 is about 279.3132660583.

The spelling of 21790876 in words is "twenty-one million, seven hundred ninety thousand, eight hundred seventy-six".