221211153 has 12 divisors (see below), whose sum is σ = 324297168. Its totient is φ = 145272600.

The previous prime is 221211149. The next prime is 221211163. The reversal of 221211153 is 351112122.

221211153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221211153 - 2² = 221211149 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221211163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182823 + ... + 184028.

It is an arithmetic number, because the mean of its divisors is an integer number (27024764).

Almost surely, 2^221211153 is an apocalyptic number.

It is an amenable number.

221211153 is a deficient number, since it is larger than the sum of its proper divisors (103086015).

221211153 is a wasteful number, since it uses less digits than its factorization.

221211153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366924 (or 366921 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 221211153 is about 14873.1688956994. The cubic root of 221211153 is about 604.7868502143.

Adding to 221211153 its reverse (351112122), we get a palindrome (572323275).

The spelling of 221211153 in words is "two hundred twenty-one million, two hundred eleven thousand, one hundred fifty-three".