221317123 has 2 divisors, whose sum is σ = 221317124. Its totient is φ = 221317122.

The previous prime is 221317121. The next prime is 221317127. The reversal of 221317123 is 321713122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221317123 - 2¹ = 221317121 is a prime.

Together with 221317121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 221317094 and 221317103.

It is not a weakly prime, because it can be changed into another prime (221317121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110658561 + 110658562.

It is an arithmetic number, because the mean of its divisors is an integer number (110658562).

Almost surely, 2^221317123 is an apocalyptic number.

221317123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221317123 is an equidigital number, since it uses as much as digits as its factorization.

221317123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 221317123 is about 14876.7309245009. The cubic root of 221317123 is about 604.8834080815.

The spelling of 221317123 in words is "two hundred twenty-one million, three hundred seventeen thousand, one hundred twenty-three".