221123141 has 4 divisors (see below), whose sum is σ = 221634252. Its totient is φ = 220612032.

The previous prime is 221123117. The next prime is 221123143. The reversal of 221123141 is 141321122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 141321122 = 2 ⋅70660561.

It can be written as a sum of positive squares in 2 ways, for example, as 25542916 + 195580225 = 5054^2 + 13985^2 .

It is a cyclic number.

It is not a de Polignac number, because 221123141 - 2²² = 216928837 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 (221123143) 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, 254906 + ... + 255771.

It is an arithmetic number, because the mean of its divisors is an integer number (55408563).

Almost surely, 2^221123141 is an apocalyptic number.

It is an amenable number.

221123141 is a deficient number, since it is larger than the sum of its proper divisors (511111).

221123141 is an equidigital number, since it uses as much as digits as its factorization.

221123141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511110.

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

The square root of 221123141 is about 14870.2098505704. The cubic root of 221123141 is about 604.7066318945.

Adding to 221123141 its reverse (141321122), we get a palindrome (362444263).

It can be divided in two parts, 2211 and 23141, that added together give a palindrome (25352).

The spelling of 221123141 in words is "two hundred twenty-one million, one hundred twenty-three thousand, one hundred forty-one".