8540221043 has 2 divisors, whose sum is σ = 8540221044. Its totient is φ = 8540221042.

The previous prime is 8540221033. The next prime is 8540221051. The reversal of 8540221043 is 3401220458.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8540221043 - 2⁶ = 8540220979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8540220997 and 8540221015.

It is not a weakly prime, because it can be changed into another prime (8540221033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4270110521 + 4270110522.

It is an arithmetic number, because the mean of its divisors is an integer number (4270110522).

Almost surely, 2^8540221043 is an apocalyptic number.

8540221043 is a deficient number, since it is larger than the sum of its proper divisors (1).

8540221043 is an equidigital number, since it uses as much as digits as its factorization.

8540221043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 8540221043 is about 92413.3163726960. The cubic root of 8540221043 is about 2044.0414756993.

The spelling of 8540221043 in words is "eight billion, five hundred forty million, two hundred twenty-one thousand, forty-three".