221696669 has 2 divisors, whose sum is σ = 221696670. Its totient is φ = 221696668.

The previous prime is 221696663. The next prime is 221696723. The reversal of 221696669 is 966696122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214271044 + 7425625 = 14638^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 221696669 - 2⁸ = 221696413 is a prime.

It is a super-2 number, since 2×221696669² = 98298826091391122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221696663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110848334 + 110848335.

It is an arithmetic number, because the mean of its divisors is an integer number (110848335).

Almost surely, 2^221696669 is an apocalyptic number.

It is an amenable number.

221696669 is a deficient number, since it is larger than the sum of its proper divisors (1).

221696669 is an equidigital number, since it uses as much as digits as its factorization.

221696669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 221696669 is about 14889.4818244289. The cubic root of 221696669 is about 605.2289905657.

The spelling of 221696669 in words is "two hundred twenty-one million, six hundred ninety-six thousand, six hundred sixty-nine".