21239876 has 24 divisors (see below), whose sum is σ = 42618240. Its totient is φ = 9073152.

The previous prime is 21239839. The next prime is 21239899. The reversal of 21239876 is 67893212.

It is a super-2 number, since 2×21239876² = 902264664990752, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8996 + ... + 11108.

It is an arithmetic number, because the mean of its divisors is an integer number (1775760).

Almost surely, 2^21239876 is an apocalyptic number.

It is an amenable number.

21239876 is an abundant number, since it is smaller than the sum of its proper divisors (21378364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21239876 is a wasteful number, since it uses less digits than its factorization.

21239876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483 (or 2481 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 21239876 is about 4608.6739958474. The cubic root of 21239876 is about 276.9389187914.

The spelling of 21239876 in words is "twenty-one million, two hundred thirty-nine thousand, eight hundred seventy-six".