221130401 has 4 divisors (see below), whose sum is σ = 223929600. Its totient is φ = 218331204.

The previous prime is 221130397. The next prime is 221130433. The reversal of 221130401 is 104031122.

221130401 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.

It is a cyclic number.

It is not a de Polignac number, because 221130401 - 2² = 221130397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221130001) 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, 1399481 + ... + 1399638.

It is an arithmetic number, because the mean of its divisors is an integer number (55982400).

Almost surely, 2^221130401 is an apocalyptic number.

It is an amenable number.

221130401 is a deficient number, since it is larger than the sum of its proper divisors (2799199).

221130401 is an equidigital number, since it uses as much as digits as its factorization.

221130401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799198.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221130401 is about 14870.4539607908. The cubic root of 221130401 is about 604.7132498090.

Adding to 221130401 its reverse (104031122), we get a palindrome (325161523).

The spelling of 221130401 in words is "two hundred twenty-one million, one hundred thirty thousand, four hundred one".