9533867221 has 4 divisors (see below), whose sum is σ = 9534066444. Its totient is φ = 9533668000.

The previous prime is 9533867197. The next prime is 9533867243. The reversal of 9533867221 is 1227683359.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5992308100 + 3541559121 = 77410^2 + 59511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9533867221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9533867261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20241 + ... + 139561.

It is an arithmetic number, because the mean of its divisors is an integer number (2383516611).

Almost surely, 2^9533867221 is an apocalyptic number.

It is an amenable number.

9533867221 is a deficient number, since it is larger than the sum of its proper divisors (199223).

9533867221 is a wasteful number, since it uses less digits than its factorization.

9533867221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199222.

The product of its digits is 544320, while the sum is 46.

The square root of 9533867221 is about 97641.5240612312. The cubic root of 9533867221 is about 2120.4255717526.

The spelling of 9533867221 in words is "nine billion, five hundred thirty-three million, eight hundred sixty-seven thousand, two hundred twenty-one".