21086802 has 48 divisors (see below), whose sum is σ = 50150880. Its totient is φ = 6350400.

The previous prime is 21086753. The next prime is 21086839. The reversal of 21086802 is 20868012.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55449 + ... + 55827.

It is an arithmetic number, because the mean of its divisors is an integer number (1044810).

Almost surely, 2^21086802 is an apocalyptic number.

21086802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21086802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25075440).

21086802 is an abundant number, since it is smaller than the sum of its proper divisors (29064078).

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

21086802 is a wasteful number, since it uses less digits than its factorization.

21086802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21086802 is about 4592.0368029884. The cubic root of 21086802 is about 276.2720222952.

The spelling of 21086802 in words is "twenty-one million, eighty-six thousand, eight hundred two".