221541013 has 4 divisors (see below), whose sum is σ = 221571360. Its totient is φ = 221510668.

The previous prime is 221540993. The next prime is 221541029. The reversal of 221541013 is 310145122.

221541013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221541013 - 2⁵ = 221540981 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 (221541913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3168 + ... + 21286.

It is an arithmetic number, because the mean of its divisors is an integer number (55392840).

Almost surely, 2^221541013 is an apocalyptic number.

It is an amenable number.

221541013 is a deficient number, since it is larger than the sum of its proper divisors (30347).

221541013 is a wasteful number, since it uses less digits than its factorization.

221541013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30346.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 221541013 is about 14884.2538610439. The cubic root of 221541013 is about 605.0873111246.

Adding to 221541013 its reverse (310145122), we get a palindrome (531686135).

The spelling of 221541013 in words is "two hundred twenty-one million, five hundred forty-one thousand, thirteen".