20218622243 has 2 divisors, whose sum is σ = 20218622244. Its totient is φ = 20218622242.

The previous prime is 20218622183. The next prime is 20218622273. The reversal of 20218622243 is 34222681202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20218622243 - 2⁸ = 20218621987 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20218622273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109311121 + 10109311122.

It is an arithmetic number, because the mean of its divisors is an integer number (10109311122).

Almost surely, 2^20218622243 is an apocalyptic number.

20218622243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218622243 is an equidigital number, since it uses as much as digits as its factorization.

20218622243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 20218622243 in words is "twenty billion, two hundred eighteen million, six hundred twenty-two thousand, two hundred forty-three".