221801013 has 24 divisors (see below), whose sum is σ = 366545088. Its totient is φ = 126605952.

The previous prime is 221800993. The next prime is 221801059. The reversal of 221801013 is 310108122.

221801013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221801013 - 2⁵ = 221800981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221801113) 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, 96706 + ... + 98972.

It is an arithmetic number, because the mean of its divisors is an integer number (15272712).

Almost surely, 2^221801013 is an apocalyptic number.

It is an amenable number.

221801013 is a deficient number, since it is larger than the sum of its proper divisors (144744075).

221801013 is a wasteful number, since it uses less digits than its factorization.

221801013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833 (or 3830 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 221801013 is about 14892.9853622435. The cubic root of 221801013 is about 605.3239282553.

Adding to 221801013 its reverse (310108122), we get a palindrome (531909135).

The spelling of 221801013 in words is "two hundred twenty-one million, eight hundred one thousand, thirteen".