221106013 has 4 divisors (see below), whose sum is σ = 221137020. Its totient is φ = 221075008.

The previous prime is 221105987. The next prime is 221106031. The reversal of 221106013 is 310601122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 121066009 + 100040004 = 11003^2 + 10002^2 .

It is a cyclic number.

It is not a de Polignac number, because 221106013 - 2⁹ = 221105501 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 (221106073) 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, 1173 + ... + 21061.

It is an arithmetic number, because the mean of its divisors is an integer number (55284255).

Almost surely, 2^221106013 is an apocalyptic number.

It is an amenable number.

221106013 is a deficient number, since it is larger than the sum of its proper divisors (31007).

221106013 is a wasteful number, since it uses less digits than its factorization.

221106013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31006.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 221106013 is about 14869.6339228644. The cubic root of 221106013 is about 604.6910181471.

Adding to 221106013 its reverse (310601122), we get a palindrome (531707135).

The spelling of 221106013 in words is "two hundred twenty-one million, one hundred six thousand, thirteen".