221130101 has 4 divisors (see below), whose sum is σ = 234137772. Its totient is φ = 208122432.

The previous prime is 221130089. The next prime is 221130103. The reversal of 221130101 is 101031122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137499076 + 83631025 = 11726^2 + 9145^2 .

It is not a de Polignac number, because 221130101 - 2¹⁸ = 220867957 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 (221130103) 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, 6503810 + ... + 6503843.

It is an arithmetic number, because the mean of its divisors is an integer number (58534443).

Almost surely, 2^221130101 is an apocalyptic number.

It is an amenable number.

221130101 is a deficient number, since it is larger than the sum of its proper divisors (13007671).

221130101 is a wasteful number, since it uses less digits than its factorization.

221130101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13007670.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 221130101 is about 14870.4438736710. The cubic root of 221130101 is about 604.7129763443.

Adding to 221130101 its reverse (101031122), we get a palindrome (322161223).

The spelling of 221130101 in words is "two hundred twenty-one million, one hundred thirty thousand, one hundred one".