221153441 has 8 divisors (see below), whose sum is σ = 231431040. Its totient is φ = 210931072.

The previous prime is 221153437. The next prime is 221153447. The reversal of 221153441 is 144351122.

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 221153441 - 2² = 221153437 is a prime.

It is a super-2 number, since 2×221153441² = 97817688932280962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221153447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5501 + ... + 21738.

It is an arithmetic number, because the mean of its divisors is an integer number (28928880).

Almost surely, 2^221153441 is an apocalyptic number.

It is an amenable number.

221153441 is a deficient number, since it is larger than the sum of its proper divisors (10277599).

221153441 is a wasteful number, since it uses less digits than its factorization.

221153441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27615.

The product of its digits is 960, while the sum is 23.

The square root of 221153441 is about 14871.2286311522. The cubic root of 221153441 is about 604.7342511568.

The spelling of 221153441 in words is "two hundred twenty-one million, one hundred fifty-three thousand, four hundred forty-one".