5640467221 has 2 divisors, whose sum is σ = 5640467222. Its totient is φ = 5640467220.

The previous prime is 5640467219. The next prime is 5640467249. The reversal of 5640467221 is 1227640465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5473928196 + 166539025 = 73986^2 + 12905^2 .

It is a cyclic number.

It is not a de Polignac number, because 5640467221 - 2¹ = 5640467219 is a prime.

Together with 5640467219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5640467291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2820233610 + 2820233611.

It is an arithmetic number, because the mean of its divisors is an integer number (2820233611).

Almost surely, 2^5640467221 is an apocalyptic number.

It is an amenable number.

5640467221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640467221 is an equidigital number, since it uses as much as digits as its factorization.

5640467221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 5640467221 is about 75103.0440195336. The cubic root of 5640467221 is about 1780.0752420536.

The spelling of 5640467221 in words is "five billion, six hundred forty million, four hundred sixty-seven thousand, two hundred twenty-one".