221057930 has 16 divisors (see below), whose sum is σ = 398235744. Its totient is φ = 88349520.

The previous prime is 221057929. The next prime is 221057957. The reversal of 221057930 is 39750122.

It is a junction number, because it is equal to n+sod(n) for n = 221057893 and 221057902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4349 + ... + 21471.

It is an arithmetic number, because the mean of its divisors is an integer number (24889734).

Almost surely, 2^221057930 is an apocalyptic number.

221057930 is a deficient number, since it is larger than the sum of its proper divisors (177177814).

221057930 is a wasteful number, since it uses less digits than its factorization.

221057930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18421.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 221057930 is about 14868.0170164013. The cubic root of 221057930 is about 604.6471817603.

The spelling of 221057930 in words is "two hundred twenty-one million, fifty-seven thousand, nine hundred thirty".