221436418 has 8 divisors (see below), whose sum is σ = 379605312. Its totient is φ = 94901316.

The previous prime is 221436409. The next prime is 221436419. The reversal of 221436418 is 814634122.

221436418 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221436418.

It is not an unprimeable number, because it can be changed into a prime (221436419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7908430 + ... + 7908457.

It is an arithmetic number, because the mean of its divisors is an integer number (47450664).

Almost surely, 2^221436418 is an apocalyptic number.

221436418 is a deficient number, since it is larger than the sum of its proper divisors (158168894).

221436418 is a wasteful number, since it uses less digits than its factorization.

221436418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15816896.

The product of its digits is 9216, while the sum is 31.

The square root of 221436418 is about 14880.7398337583. The cubic root of 221436418 is about 604.9920705652.

It can be divided in two parts, 22143 and 6418, that added together give a 4-th power (28561 = 13⁴).

The spelling of 221436418 in words is "two hundred twenty-one million, four hundred thirty-six thousand, four hundred eighteen".