21165802 has 16 divisors (see below), whose sum is σ = 36694080. Its totient is φ = 8968608.

The previous prime is 21165787. The next prime is 21165811. The reversal of 21165802 is 20856112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7248 + ... + 9739.

It is an arithmetic number, because the mean of its divisors is an integer number (2293380).

Almost surely, 2^21165802 is an apocalyptic number.

21165802 is a deficient number, since it is larger than the sum of its proper divisors (15528278).

21165802 is a wasteful number, since it uses less digits than its factorization.

21165802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17085.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 21165802 is about 4600.6306089492. The cubic root of 21165802 is about 276.6166026088.

The spelling of 21165802 in words is "twenty-one million, one hundred sixty-five thousand, eight hundred two".