21004998198 has 32 divisors (see below), whose sum is σ = 43155431424. Its totient is φ = 6810848352.

The previous prime is 21004998169. The next prime is 21004998251. The reversal of 21004998198 is 89189940012.

It is a self number, because there is not a number n which added to its sum of digits gives 21004998198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1294411 + ... + 1310537.

It is an arithmetic number, because the mean of its divisors is an integer number (1348607232).

Almost surely, 2^21004998198 is an apocalyptic number.

21004998198 is an abundant number, since it is smaller than the sum of its proper divisors (22150433226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21004998198 is a wasteful number, since it uses less digits than its factorization.

21004998198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22036.

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 21004998198 in words is "twenty-one billion, four million, nine hundred ninety-eight thousand, one hundred ninety-eight".