21240876 has 48 divisors (see below), whose sum is σ = 52093440. Its totient is φ = 6726720.

The previous prime is 21240833. The next prime is 21240881. The reversal of 21240876 is 67804212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22861 + ... + 23771.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^21240876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21240876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26046720).

21240876 is an abundant number, since it is smaller than the sum of its proper divisors (30852564).

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

21240876 is a wasteful number, since it uses less digits than its factorization.

21240876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21240876 is about 4608.7824856463. The cubic root of 21240876 is about 276.9432649337.

The spelling of 21240876 in words is "twenty-one million, two hundred forty thousand, eight hundred seventy-six".