1100212111961 has 2 divisors, whose sum is σ = 1100212111962. Its totient is φ = 1100212111960.

The previous prime is 1100212111949. The next prime is 1100212112059. The reversal of 1100212111961 is 1691112120011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974563840000 + 125648271961 = 987200^2 + 354469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100212111961 - 2²² = 1100207917657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1100212111961.

It is not a weakly prime, because it can be changed into another prime (1100212111931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550106055980 + 550106055981.

It is an arithmetic number, because the mean of its divisors is an integer number (550106055981).

Almost surely, 2^{1100212111961} is an apocalyptic number.

It is an amenable number.

1100212111961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100212111961 is an equidigital number, since it uses as much as digits as its factorization.

1100212111961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 26.

Adding to 1100212111961 its reverse (1691112120011), we get a palindrome (2791324231972).

The spelling of 1100212111961 in words is "one trillion, one hundred billion, two hundred twelve million, one hundred eleven thousand, nine hundred sixty-one".