6140643221 has 2 divisors, whose sum is σ = 6140643222. Its totient is φ = 6140643220.

The previous prime is 6140643211. The next prime is 6140643259. The reversal of 6140643221 is 1223460416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6035580721 + 105062500 = 77689^2 + 10250^2 .

It is a cyclic number.

It is not a de Polignac number, because 6140643221 - 2¹⁸ = 6140381077 is a prime.

It is a super-2 number, since 2×6140643221² = 75414998335226509682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6140643211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3070321610 + 3070321611.

It is an arithmetic number, because the mean of its divisors is an integer number (3070321611).

Almost surely, 2^6140643221 is an apocalyptic number.

It is an amenable number.

6140643221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6140643221 is an equidigital number, since it uses as much as digits as its factorization.

6140643221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6140643221 is about 78362.2563547018. The cubic root of 6140643221 is about 1831.2091723964.

The spelling of 6140643221 in words is "six billion, one hundred forty million, six hundred forty-three thousand, two hundred twenty-one".