221795438 has 4 divisors (see below), whose sum is σ = 332693160. Its totient is φ = 110897718.

The previous prime is 221795429. The next prime is 221795443. The reversal of 221795438 is 834597122.

221795438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×221795438² = 98386432635223688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221795395 and 221795404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55448858 + ... + 55448861.

It is an arithmetic number, because the mean of its divisors is an integer number (83173290).

Almost surely, 2^221795438 is an apocalyptic number.

221795438 is a deficient number, since it is larger than the sum of its proper divisors (110897722).

221795438 is a wasteful number, since it uses less digits than its factorization.

221795438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110897721.

The product of its digits is 120960, while the sum is 41.

The square root of 221795438 is about 14892.7981924150. The cubic root of 221795438 is about 605.3188565785.

The spelling of 221795438 in words is "two hundred twenty-one million, seven hundred ninety-five thousand, four hundred thirty-eight".