21018323330 has 32 divisors (see below), whose sum is σ = 40400087040. Its totient is φ = 7855565760.

The previous prime is 21018323329. The next prime is 21018323351. The reversal of 21018323330 is 3332381012.

It is a self number, because there is not a number n which added to its sum of digits gives 21018323330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159994 + ... + 1177973.

It is an arithmetic number, because the mean of its divisors is an integer number (1262502720).

Almost surely, 2^21018323330 is an apocalyptic number.

21018323330 is a deficient number, since it is larger than the sum of its proper divisors (19381763710).

21018323330 is a wasteful number, since it uses less digits than its factorization.

21018323330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338034.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 21018323330 in words is "twenty-one billion, eighteen million, three hundred twenty-three thousand, three hundred thirty".