8221403309 has 12 divisors (see below), whose sum is σ = 9566571744. Its totient is φ = 7044781464.

The previous prime is 8221403263. The next prime is 8221403327. The reversal of 8221403309 is 9033041228.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-8221403309 is a prime.

It is a super-2 number, since 2×8221403309² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221403009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150152 + ... + 197454.

It is an arithmetic number, because the mean of its divisors is an integer number (797214312).

Almost surely, 2^8221403309 is an apocalyptic number.

It is an amenable number.

8221403309 is a deficient number, since it is larger than the sum of its proper divisors (1345168435).

8221403309 is a wasteful number, since it uses less digits than its factorization.

8221403309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50864 (or 50857 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 8221403309 is about 90671.9543684815. The cubic root of 8221403309 is about 2018.2826390496.

The spelling of 8221403309 in words is "eight billion, two hundred twenty-one million, four hundred three thousand, three hundred nine".