221401198 has 4 divisors (see below), whose sum is σ = 332101800. Its totient is φ = 110700598.

The previous prime is 221401181. The next prime is 221401199. The reversal of 221401198 is 891104122.

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 (221401199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55350298 + ... + 55350301.

It is an arithmetic number, because the mean of its divisors is an integer number (83025450).

Almost surely, 2^221401198 is an apocalyptic number.

221401198 is a deficient number, since it is larger than the sum of its proper divisors (110700602).

221401198 is a wasteful number, since it uses less digits than its factorization.

221401198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110700601.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 221401198 is about 14879.5563777957. The cubic root of 221401198 is about 604.9599937119.

The spelling of 221401198 in words is "two hundred twenty-one million, four hundred one thousand, one hundred ninety-eight".