1321201012111 has 2 divisors, whose sum is σ = 1321201012112. Its totient is φ = 1321201012110.

The previous prime is 1321201012093. The next prime is 1321201012121. The reversal of 1321201012111 is 1112101021231.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321201012111 is a prime.

It is a super-2 number, since 2×1321201012111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321201012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660600506055 + 660600506056.

It is an arithmetic number, because the mean of its divisors is an integer number (660600506056).

Almost surely, 2^{1321201012111} is an apocalyptic number.

1321201012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321201012111 is an equidigital number, since it uses as much as digits as its factorization.

1321201012111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1321201012111 its reverse (1112101021231), we get a palindrome (2433302033342).

The spelling of 1321201012111 in words is "one trillion, three hundred twenty-one billion, two hundred one million, twelve thousand, one hundred eleven".