221660153 has 16 divisors (see below), whose sum is σ = 264691392. Its totient is φ = 182952000.

The previous prime is 221660129. The next prime is 221660171. The reversal of 221660153 is 351066122.

It is not a de Polignac number, because 221660153 - 2¹⁶ = 221594617 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221660113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3983 + ... + 21428.

It is an arithmetic number, because the mean of its divisors is an integer number (16543212).

Almost surely, 2^221660153 is an apocalyptic number.

It is an amenable number.

221660153 is a deficient number, since it is larger than the sum of its proper divisors (43031239).

221660153 is a wasteful number, since it uses less digits than its factorization.

221660153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25496.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 221660153 is about 14888.2555391826. The cubic root of 221660153 is about 605.1957593412.

The spelling of 221660153 in words is "two hundred twenty-one million, six hundred sixty thousand, one hundred fifty-three".