221379930 has 24 divisors (see below), whose sum is σ = 575588052. Its totient is φ = 59034624.

The previous prime is 221379929. The next prime is 221379931. The reversal of 221379930 is 39973122.

It is an interprime number because it is at equal distance from previous prime (221379929) and next prime (221379931).

It can be written as a sum of positive squares in 2 ways, for example, as 221146641 + 233289 = 14871^2 + 483^2 .

It is not an unprimeable number, because it can be changed into a prime (221379931) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1229799 + ... + 1229978.

Almost surely, 2^221379930 is an apocalyptic number.

221379930 is an abundant number, since it is smaller than the sum of its proper divisors (354208122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221379930 is a wasteful number, since it uses less digits than its factorization.

221379930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459790 (or 2459787 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 221379930 is about 14878.8416887875. The cubic root of 221379930 is about 604.9406220896.

The spelling of 221379930 in words is "two hundred twenty-one million, three hundred seventy-nine thousand, nine hundred thirty".