221055418 has 16 divisors (see below), whose sum is σ = 338470560. Its totient is φ = 108246096.

The previous prime is 221055409. The next prime is 221055431. The reversal of 221055418 is 814550122.

221055418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29305 + ... + 36067.

It is an arithmetic number, because the mean of its divisors is an integer number (21154410).

Almost surely, 2^221055418 is an apocalyptic number.

221055418 is a deficient number, since it is larger than the sum of its proper divisors (117415142).

221055418 is a wasteful number, since it uses less digits than its factorization.

221055418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7101.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 221055418 is about 14867.9325395295. The cubic root of 221055418 is about 604.6448914414.

The spelling of 221055418 in words is "two hundred twenty-one million, fifty-five thousand, four hundred eighteen".