221135023541 has 4 divisors (see below), whose sum is σ = 223201706112. Its totient is φ = 219068340972.

The previous prime is 221135023523. The next prime is 221135023553. The reversal of 221135023541 is 145320531122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221135023541 - 2²² = 221130829237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221135023511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1033341125 + ... + 1033341338.

It is an arithmetic number, because the mean of its divisors is an integer number (55800426528).

Almost surely, 2^221135023541 is an apocalyptic number.

It is an amenable number.

221135023541 is a deficient number, since it is larger than the sum of its proper divisors (2066682571).

221135023541 is a wasteful number, since it uses less digits than its factorization.

221135023541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066682570.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 221135023541 its reverse (145320531122), we get a palindrome (366455554663).

The spelling of 221135023541 in words is "two hundred twenty-one billion, one hundred thirty-five million, twenty-three thousand, five hundred forty-one".