221123113 has 2 divisors, whose sum is σ = 221123114. Its totient is φ = 221123112.

The previous prime is 221123101. The next prime is 221123117. The reversal of 221123113 is 311321122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122478489 + 98644624 = 11067^2 + 9932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123113 is a prime.

It is a super-2 number, since 2×221123113² = 97790862205621538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221123117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561556 + 110561557.

It is an arithmetic number, because the mean of its divisors is an integer number (110561557).

Almost surely, 2^221123113 is an apocalyptic number.

It is an amenable number.

221123113 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123113 is an equidigital number, since it uses as much as digits as its factorization.

221123113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 221123113 is about 14870.2089090907. The cubic root of 221123113 is about 604.7066063706.

Adding to 221123113 its reverse (311321122), we get a palindrome (532444235).

The spelling of 221123113 in words is "two hundred twenty-one million, one hundred twenty-three thousand, one hundred thirteen".