1211021220163 has 2 divisors, whose sum is σ = 1211021220164. Its totient is φ = 1211021220162.

The previous prime is 1211021220023. The next prime is 1211021220169. The reversal of 1211021220163 is 3610221201121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211021220163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211021220169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605510610081 + 605510610082.

It is an arithmetic number, because the mean of its divisors is an integer number (605510610082).

Almost surely, 2^{1211021220163} is an apocalyptic number.

1211021220163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211021220163 is an equidigital number, since it uses as much as digits as its factorization.

1211021220163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1211021220163 its reverse (3610221201121), we get a palindrome (4821242421284).

The spelling of 1211021220163 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twenty thousand, one hundred sixty-three".