221100145 has 8 divisors (see below), whose sum is σ = 303223104. Its totient is φ = 151611504.

The previous prime is 221100133. The next prime is 221100157. The reversal of 221100145 is 541001122.

It is an interprime number because it is at equal distance from previous prime (221100133) and next prime (221100157).

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

It is a cyclic number.

It is not a de Polignac number, because 221100145 - 2¹⁹ = 220575857 is a prime.

It is a Duffinian number.

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, 3158539 + ... + 3158608.

It is an arithmetic number, because the mean of its divisors is an integer number (37902888).

Almost surely, 2^221100145 is an apocalyptic number.

It is an amenable number.

221100145 is a deficient number, since it is larger than the sum of its proper divisors (82122959).

221100145 is an equidigital number, since it uses as much as digits as its factorization.

221100145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317159.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221100145 is about 14869.4366066775. The cubic root of 221100145 is about 604.6856687399.

Adding to 221100145 its reverse (541001122), we get a palindrome (762101267).

The spelling of 221100145 in words is "two hundred twenty-one million, one hundred thousand, one hundred forty-five".