21045603966 has 8 divisors (see below), whose sum is σ = 42091207944. Its totient is φ = 7015201320.

The previous prime is 21045603937. The next prime is 21045603967. The reversal of 21045603966 is 66930654012.

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

21045603966 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045603967) 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, 1753800325 + ... + 1753800336.

It is an arithmetic number, because the mean of its divisors is an integer number (5261400993).

Almost surely, 2^21045603966 is an apocalyptic number.

21045603966 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.

21045603966 is a wasteful number, since it uses less digits than its factorization.

21045603966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507600666.

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 21045603966 in words is "twenty-one billion, forty-five million, six hundred three thousand, nine hundred sixty-six".