221312141 has 4 divisors (see below), whose sum is σ = 230934432. Its totient is φ = 211689852.

The previous prime is 221312081. The next prime is 221312149. The reversal of 221312141 is 141213122.

221312141 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 221312141 - 2¹⁴ = 221295757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312149) 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, 4811111 + ... + 4811156.

It is an arithmetic number, because the mean of its divisors is an integer number (57733608).

Almost surely, 2^221312141 is an apocalyptic number.

It is an amenable number.

221312141 is a deficient number, since it is larger than the sum of its proper divisors (9622291).

221312141 is an equidigital number, since it uses as much as digits as its factorization.

221312141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622290.

The product of its digits is 96, while the sum is 17.

The square root of 221312141 is about 14876.5634808581. The cubic root of 221312141 is about 604.8788692675.

Adding to 221312141 its reverse (141213122), we get a palindrome (362525263).

The spelling of 221312141 in words is "two hundred twenty-one million, three hundred twelve thousand, one hundred forty-one".