222221221811 has 2 divisors, whose sum is σ = 222221221812. Its totient is φ = 222221221810.

The previous prime is 222221221787. The next prime is 222221221867. The reversal of 222221221811 is 118122122222.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221221811 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (222221221891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110610905 + 111110610906.

It is an arithmetic number, because the mean of its divisors is an integer number (111110610906).

Almost surely, 2^222221221811 is an apocalyptic number.

222221221811 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221221811 is an equidigital number, since it uses as much as digits as its factorization.

222221221811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024, while the sum is 26.

The spelling of 222221221811 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, eight hundred eleven".