21014444666 has 8 divisors (see below), whose sum is σ = 31710420000. Its totient is φ = 10444304668.

The previous prime is 21014444663. The next prime is 21014444677. The reversal of 21014444666 is 66644441012.

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

It is not an unprimeable number, because it can be changed into a prime (21014444663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31458416 + ... + 31459083.

It is an arithmetic number, because the mean of its divisors is an integer number (3963802500).

Almost surely, 2^21014444666 is an apocalyptic number.

21014444666 is a deficient number, since it is larger than the sum of its proper divisors (10695975334).

21014444666 is a wasteful number, since it uses less digits than its factorization.

21014444666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62917668.

The product of its (nonzero) digits is 110592, while the sum is 38.

Adding to 21014444666 its reverse (66644441012), we get a palindrome (87658885678).

The spelling of 21014444666 in words is "twenty-one billion, fourteen million, four hundred forty-four thousand, six hundred sixty-six".