21440330994 has 8 divisors (see below), whose sum is σ = 42880662000. Its totient is φ = 7146776996.

The previous prime is 21440330957. The next prime is 21440331001. The reversal of 21440330994 is 49903304412.

It is a sphenic number, since it is the product of 3 distinct primes.

21440330994 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786694244 + ... + 1786694255.

It is an arithmetic number, because the mean of its divisors is an integer number (5360082750).

Almost surely, 2^21440330994 is an apocalyptic number.

21440330994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21440330994 is a wasteful number, since it uses less digits than its factorization.

21440330994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573388504.

The product of its (nonzero) digits is 93312, while the sum is 39.

The spelling of 21440330994 in words is "twenty-one billion, four hundred forty million, three hundred thirty thousand, nine hundred ninety-four".