21030217306 has 16 divisors (see below), whose sum is σ = 36061372224. Its totient is φ = 9010557504.

The previous prime is 21030217277. The next prime is 21030217331. The reversal of 21030217306 is 60371203012.

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, 144255 + ... + 250738.

It is an arithmetic number, because the mean of its divisors is an integer number (2253835764).

Almost surely, 2^21030217306 is an apocalyptic number.

21030217306 is a deficient number, since it is larger than the sum of its proper divisors (15031154918).

21030217306 is a wasteful number, since it uses less digits than its factorization.

21030217306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398805.

The product of its (nonzero) digits is 1512, while the sum is 25.

The spelling of 21030217306 in words is "twenty-one billion, thirty million, two hundred seventeen thousand, three hundred six".