21022112198 has 4 divisors (see below), whose sum is σ = 31533168300. Its totient is φ = 10511056098.

The previous prime is 21022112197. The next prime is 21022112207. The reversal of 21022112198 is 89121122012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21022112198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022112197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255528048 + ... + 5255528051.

It is an arithmetic number, because the mean of its divisors is an integer number (7883292075).

Almost surely, 2^21022112198 is an apocalyptic number.

21022112198 is a deficient number, since it is larger than the sum of its proper divisors (10511056102).

21022112198 is a wasteful number, since it uses less digits than its factorization.

21022112198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511056101.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 21022112198 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, one hundred ninety-eight".