21042663698 has 8 divisors (see below), whose sum is σ = 36073137792. Its totient is φ = 9018284436.

The previous prime is 21042663689. The next prime is 21042663713. The reversal of 21042663698 is 89636624012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751523690 + ... + 751523717.

It is an arithmetic number, because the mean of its divisors is an integer number (4509142224).

Almost surely, 2^21042663698 is an apocalyptic number.

21042663698 is a deficient number, since it is larger than the sum of its proper divisors (15030474094).

21042663698 is a wasteful number, since it uses less digits than its factorization.

21042663698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503047416.

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 21042663698 in words is "twenty-one billion, forty-two million, six hundred sixty-three thousand, six hundred ninety-eight".