221938079 has 6 divisors (see below), whose sum is σ = 243948600. Its totient is φ = 201761780.

The previous prime is 221938051. The next prime is 221938081. The reversal of 221938079 is 970839122.

It is a happy number.

It is not a de Polignac number, because 221938079 - 2¹² = 221933983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221938019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 916979 + ... + 917220.

It is an arithmetic number, because the mean of its divisors is an integer number (40658100).

Almost surely, 2^221938079 is an apocalyptic number.

221938079 is a deficient number, since it is larger than the sum of its proper divisors (22010521).

221938079 is a wasteful number, since it uses less digits than its factorization.

221938079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834221 (or 1834210 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 221938079 is about 14897.5863481304. The cubic root of 221938079 is about 605.4485929168.

The spelling of 221938079 in words is "two hundred twenty-one million, nine hundred thirty-eight thousand, seventy-nine".