21030802 has 16 divisors (see below), whose sum is σ = 35971992. Its totient is φ = 9135360.

The previous prime is 21030797. The next prime is 21030857. The reversal of 21030802 is 20803012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18931201 + 2099601 = 4351^2 + 1449^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23349 + ... + 24232.

Almost surely, 2^21030802 is an apocalyptic number.

21030802 is a deficient number, since it is larger than the sum of its proper divisors (14941190).

21030802 is a wasteful number, since it uses less digits than its factorization.

21030802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47613.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21030802 is about 4585.9352372226. The cubic root of 21030802 is about 276.0272412375.

Adding to 21030802 its reverse (20803012), we get a palindrome (41833814).

The spelling of 21030802 in words is "twenty-one million, thirty thousand, eight hundred two".