221132541 has 24 divisors (see below), whose sum is σ = 343689024. Its totient is φ = 126100800.

The previous prime is 221132519. The next prime is 221132563. The reversal of 221132541 is 145231122.

It is an interprime number because it is at equal distance from previous prime (221132519) and next prime (221132563).

It is not a de Polignac number, because 221132541 - 2⁹ = 221132029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221132591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87096 + ... + 89598.

It is an arithmetic number, because the mean of its divisors is an integer number (14320376).

Almost surely, 2^221132541 is an apocalyptic number.

221132541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221132541 is a deficient number, since it is larger than the sum of its proper divisors (122556483).

221132541 is a wasteful number, since it uses less digits than its factorization.

221132541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3114 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 221132541 is about 14870.5259153804. The cubic root of 221132541 is about 604.7152005164.

Adding to 221132541 its reverse (145231122), we get a palindrome (366363663).

The spelling of 221132541 in words is "two hundred twenty-one million, one hundred thirty-two thousand, five hundred forty-one".