9969567221 has 2 divisors, whose sum is σ = 9969567222. Its totient is φ = 9969567220.

The previous prime is 9969567199. The next prime is 9969567229. The reversal of 9969567221 is 1227659699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7887926596 + 2081640625 = 88814^2 + 45625^2 .

It is a cyclic number.

It is not a de Polignac number, because 9969567221 - 2¹⁰ = 9969566197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9969567229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4984783610 + 4984783611.

It is an arithmetic number, because the mean of its divisors is an integer number (4984783611).

Almost surely, 2^9969567221 is an apocalyptic number.

It is an amenable number.

9969567221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9969567221 is an equidigital number, since it uses as much as digits as its factorization.

9969567221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 9969567221 is about 99847.7201592505. The cubic root of 9969567221 is about 2152.2469547402.

The spelling of 9969567221 in words is "nine billion, nine hundred sixty-nine million, five hundred sixty-seven thousand, two hundred twenty-one".