221696723 has 2 divisors, whose sum is σ = 221696724. Its totient is φ = 221696722.

The previous prime is 221696669. The next prime is 221696729. The reversal of 221696723 is 327696122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221696723 - 2⁶ = 221696659 is a prime.

It is not a weakly prime, because it can be changed into another prime (221696729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110848361 + 110848362.

It is an arithmetic number, because the mean of its divisors is an integer number (110848362).

Almost surely, 2^221696723 is an apocalyptic number.

221696723 is a deficient number, since it is larger than the sum of its proper divisors (1).

221696723 is an equidigital number, since it uses as much as digits as its factorization.

221696723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 221696723 is about 14889.4836377895. The cubic root of 221696723 is about 605.2290397054.

The spelling of 221696723 in words is "two hundred twenty-one million, six hundred ninety-six thousand, seven hundred twenty-three".