21065802 has 32 divisors (see below), whose sum is σ = 44680704. Its totient is φ = 6609600.

The previous prime is 21065797. The next prime is 21065809. The reversal of 21065802 is 20856012.

It is not an unprimeable number, because it can be changed into a prime (21065809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5352 + ... + 8412.

It is an arithmetic number, because the mean of its divisors is an integer number (1396272).

Almost surely, 2^21065802 is an apocalyptic number.

21065802 is an abundant number, since it is smaller than the sum of its proper divisors (23614902).

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

21065802 is a wasteful number, since it uses less digits than its factorization.

21065802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21065802 is about 4589.7496663762. The cubic root of 21065802 is about 276.1802802429.

The spelling of 21065802 in words is "twenty-one million, sixty-five thousand, eight hundred two".