8435939221 has 2 divisors, whose sum is σ = 8435939222. Its totient is φ = 8435939220.

The previous prime is 8435939167. The next prime is 8435939293. The reversal of 8435939221 is 1229395348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5239732996 + 3196206225 = 72386^2 + 56535^2 .

It is a cyclic number.

It is not a de Polignac number, because 8435939221 - 2²³ = 8427550613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8435939321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4217969610 + 4217969611.

It is an arithmetic number, because the mean of its divisors is an integer number (4217969611).

Almost surely, 2^8435939221 is an apocalyptic number.

It is an amenable number.

8435939221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8435939221 is an equidigital number, since it uses as much as digits as its factorization.

8435939221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 46.

The square root of 8435939221 is about 91847.3691566612. The cubic root of 8435939221 is about 2035.6876756382.

The spelling of 8435939221 in words is "eight billion, four hundred thirty-five million, nine hundred thirty-nine thousand, two hundred twenty-one".