21795081698 has 8 divisors (see below), whose sum is σ = 35207439708. Its totient is φ = 10059268464.

The previous prime is 21795081691. The next prime is 21795081713. The reversal of 21795081698 is 89618059712.

21795081698 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19691666929 + 2103414769 = 140327^2 + 45863^2 .

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 (21795081691) 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, 419136161 + ... + 419136212.

Almost surely, 2^21795081698 is an apocalyptic number.

21795081698 is a deficient number, since it is larger than the sum of its proper divisors (13412358010).

21795081698 is a wasteful number, since it uses less digits than its factorization.

21795081698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838272388.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 21795081698 in words is "twenty-one billion, seven hundred ninety-five million, eighty-one thousand, six hundred ninety-eight".