21944180198 has 4 divisors (see below), whose sum is σ = 32916270300. Its totient is φ = 10972090098.

The previous prime is 21944180191. The next prime is 21944180221. The reversal of 21944180198 is 89108144912.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944180191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5486045048 + ... + 5486045051.

It is an arithmetic number, because the mean of its divisors is an integer number (8229067575).

Almost surely, 2^21944180198 is an apocalyptic number.

21944180198 is a deficient number, since it is larger than the sum of its proper divisors (10972090102).

21944180198 is a wasteful number, since it uses less digits than its factorization.

21944180198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972090101.

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 21944180198 in words is "twenty-one billion, nine hundred forty-four million, one hundred eighty thousand, one hundred ninety-eight".