1221310200811 has 2 divisors, whose sum is σ = 1221310200812. Its totient is φ = 1221310200810.

The previous prime is 1221310200797. The next prime is 1221310200821. The reversal of 1221310200811 is 1180020131221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221310200811 - 2⁷ = 1221310200683 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221310200821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610655100405 + 610655100406.

It is an arithmetic number, because the mean of its divisors is an integer number (610655100406).

Almost surely, 2^{1221310200811} is an apocalyptic number.

1221310200811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221310200811 is an equidigital number, since it uses as much as digits as its factorization.

1221310200811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The spelling of 1221310200811 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, two hundred thousand, eight hundred eleven".