21098368898 has 16 divisors (see below), whose sum is σ = 32939714880. Its totient is φ = 10122927696.

The previous prime is 21098368897. The next prime is 21098368909. The reversal of 21098368898 is 89886389012.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21098368898.

It is not an unprimeable number, because it can be changed into a prime (21098368897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106390 + ... + 1125297.

It is an arithmetic number, because the mean of its divisors is an integer number (2058732180).

Almost surely, 2^21098368898 is an apocalyptic number.

21098368898 is a deficient number, since it is larger than the sum of its proper divisors (11841345982).

21098368898 is a wasteful number, since it uses less digits than its factorization.

21098368898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231881.

The product of its (nonzero) digits is 11943936, while the sum is 62.

The spelling of 21098368898 in words is "twenty-one billion, ninety-eight million, three hundred sixty-eight thousand, eight hundred ninety-eight".