221138930 has 8 divisors (see below), whose sum is σ = 398050092. Its totient is φ = 88455568.

The previous prime is 221138921. The next prime is 221138947. The reversal of 221138930 is 39831122.

It can be written as a sum of positive squares in 2 ways, for example, as 208600249 + 12538681 = 14443^2 + 3541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 221138893 and 221138902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11056937 + ... + 11056956.

Almost surely, 2^221138930 is an apocalyptic number.

221138930 is a deficient number, since it is larger than the sum of its proper divisors (176911162).

221138930 is a wasteful number, since it uses less digits than its factorization.

221138930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22113900.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221138930 is about 14870.7407347449. The cubic root of 221138930 is about 604.7210243061.

The spelling of 221138930 in words is "two hundred twenty-one million, one hundred thirty-eight thousand, nine hundred thirty".