221200123 has 2 divisors, whose sum is σ = 221200124. Its totient is φ = 221200122.

The previous prime is 221200121. The next prime is 221200151. The reversal of 221200123 is 321002122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221200123 - 2¹ = 221200121 is a prime.

Together with 221200121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600061 + 110600062.

It is an arithmetic number, because the mean of its divisors is an integer number (110600062).

Almost surely, 2^221200123 is an apocalyptic number.

221200123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200123 is an equidigital number, since it uses as much as digits as its factorization.

221200123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221200123 is about 14872.7980891290. The cubic root of 221200123 is about 604.7767981144.

Adding to 221200123 its reverse (321002122), we get a palindrome (542202245).

The spelling of 221200123 in words is "two hundred twenty-one million, two hundred thousand, one hundred twenty-three".