1021121312111 has 2 divisors, whose sum is σ = 1021121312112. Its totient is φ = 1021121312110.

The previous prime is 1021121312093. The next prime is 1021121312119. The reversal of 1021121312111 is 1112131211201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021121312111 - 2⁶ = 1021121312047 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021121312111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021121312119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510560656055 + 510560656056.

It is an arithmetic number, because the mean of its divisors is an integer number (510560656056).

Almost surely, 2^{1021121312111} is an apocalyptic number.

1021121312111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021121312111 is an equidigital number, since it uses as much as digits as its factorization.

1021121312111 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 17.

Adding to 1021121312111 its reverse (1112131211201), we get a palindrome (2133252523312).

The spelling of 1021121312111 in words is "one trillion, twenty-one billion, one hundred twenty-one million, three hundred twelve thousand, one hundred eleven".