221240154 has 8 divisors (see below), whose sum is σ = 442480320. Its totient is φ = 73746716.

The previous prime is 221240143. The next prime is 221240171. The reversal of 221240154 is 451042122.

221240154 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.

221240154 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 221240154.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18436674 + ... + 18436685.

It is an arithmetic number, because the mean of its divisors is an integer number (55310040).

Almost surely, 2^221240154 is an apocalyptic number.

221240154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221240154 is a wasteful number, since it uses less digits than its factorization.

221240154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36873364.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221240154 is about 14874.1438072919. The cubic root of 221240154 is about 604.8132784433.

Adding to 221240154 its reverse (451042122), we get a palindrome (672282276).

The spelling of 221240154 in words is "two hundred twenty-one million, two hundred forty thousand, one hundred fifty-four".