102211021811 has 2 divisors, whose sum is σ = 102211021812. Its totient is φ = 102211021810.

The previous prime is 102211021807. The next prime is 102211021853. The reversal of 102211021811 is 118120112201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102211021811 - 2² = 102211021807 is a prime.

It is not a weakly prime, because it can be changed into another prime (102211921811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51105510905 + 51105510906.

It is an arithmetic number, because the mean of its divisors is an integer number (51105510906).

Almost surely, 2^102211021811 is an apocalyptic number.

102211021811 is a deficient number, since it is larger than the sum of its proper divisors (1).

102211021811 is an equidigital number, since it uses as much as digits as its factorization.

102211021811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

The spelling of 102211021811 in words is "one hundred two billion, two hundred eleven million, twenty-one thousand, eight hundred eleven".