221361823 has 2 divisors, whose sum is σ = 221361824. Its totient is φ = 221361822.

The previous prime is 221361739. The next prime is 221361839. The reversal of 221361823 is 328163122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221361823 - 2¹³ = 221353631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221361791 and 221361800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221301823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110680911 + 110680912.

It is an arithmetic number, because the mean of its divisors is an integer number (110680912).

Almost surely, 2^221361823 is an apocalyptic number.

221361823 is a deficient number, since it is larger than the sum of its proper divisors (1).

221361823 is an equidigital number, since it uses as much as digits as its factorization.

221361823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 221361823 is about 14878.2331948387. The cubic root of 221361823 is about 604.9241286364.

The spelling of 221361823 in words is "two hundred twenty-one million, three hundred sixty-one thousand, eight hundred twenty-three".