8221639190447 has 2 divisors, whose sum is σ = 8221639190448. Its totient is φ = 8221639190446.

The previous prime is 8221639190407. The next prime is 8221639190473. The reversal of 8221639190447 is 7440919361228.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8221639190447 - 2²² = 8221634996143 is a prime.

It is a super-3 number, since 3×8221639190447³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8221639190392 and 8221639190401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8221639190407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110819595223 + 4110819595224.

It is an arithmetic number, because the mean of its divisors is an integer number (4110819595224).

Almost surely, 2^{8221639190447} is an apocalyptic number.

8221639190447 is a deficient number, since it is larger than the sum of its proper divisors (1).

8221639190447 is an equidigital number, since it uses as much as digits as its factorization.

8221639190447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 8221639190447 in words is "eight trillion, two hundred twenty-one billion, six hundred thirty-nine million, one hundred ninety thousand, four hundred forty-seven".