221034155 has 4 divisors (see below), whose sum is σ = 265240992. Its totient is φ = 176827320.

The previous prime is 221034137. The next prime is 221034211. The reversal of 221034155 is 551430122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221034155 - 2⁸ = 221033899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221034155.

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, 22103411 + ... + 22103420.

It is an arithmetic number, because the mean of its divisors is an integer number (66310248).

Almost surely, 2^221034155 is an apocalyptic number.

221034155 is a deficient number, since it is larger than the sum of its proper divisors (44206837).

221034155 is an equidigital number, since it uses as much as digits as its factorization.

221034155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44206836.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 221034155 is about 14867.2174599015. The cubic root of 221034155 is about 604.6255041814.

Adding to 221034155 its reverse (551430122), we get a palindrome (772464277).

The spelling of 221034155 in words is "two hundred twenty-one million, thirty-four thousand, one hundred fifty-five".