21002210018 has 16 divisors (see below), whose sum is σ = 32880560256. Its totient is φ = 10042232640.

The previous prime is 21002210017. The next prime is 21002210039. The reversal of 21002210018 is 81001220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002209978 and 21002210005.

It is not an unprimeable number, because it can be changed into a prime (21002210017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159755 + ... + 259857.

It is an arithmetic number, because the mean of its divisors is an integer number (2055035016).

Almost surely, 2^21002210018 is an apocalyptic number.

21002210018 is a deficient number, since it is larger than the sum of its proper divisors (11878350238).

21002210018 is a wasteful number, since it uses less digits than its factorization.

21002210018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104689.

The product of its (nonzero) digits is 64, while the sum is 17.

The spelling of 21002210018 in words is "twenty-one billion, two million, two hundred ten thousand, eighteen".