221838375 has 48 divisors (see below), whose sum is σ = 405830880. Its totient is φ = 107536000.

The previous prime is 221838373. The next prime is 221838377. The reversal of 221838375 is 573838122.

It is an interprime number because it is at equal distance from previous prime (221838373) and next prime (221838377).

It is not a de Polignac number, because 221838375 - 2¹ = 221838373 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221838373) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42931 + ... + 47819.

It is an arithmetic number, because the mean of its divisors is an integer number (8454810).

Almost surely, 2^221838375 is an apocalyptic number.

221838375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221838375 is a deficient number, since it is larger than the sum of its proper divisors (183992505).

221838375 is a wasteful number, since it uses less digits than its factorization.

221838375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4929 (or 4908 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 221838375 is about 14894.2396583377. The cubic root of 221838375 is about 605.3579149393.

The spelling of 221838375 in words is "two hundred twenty-one million, eight hundred thirty-eight thousand, three hundred seventy-five".