1210001110561 has 2 divisors, whose sum is σ = 1210001110562. Its totient is φ = 1210001110560.

The previous prime is 1210001110553. The next prime is 1210001110631. The reversal of 1210001110561 is 1650111000121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 731025000000 + 478976110561 = 855000^2 + 692081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210001110561 - 2³ = 1210001110553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210001110501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605000555280 + 605000555281.

It is an arithmetic number, because the mean of its divisors is an integer number (605000555281).

Almost surely, 2^{1210001110561} is an apocalyptic number.

It is an amenable number.

1210001110561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210001110561 is an equidigital number, since it uses as much as digits as its factorization.

1210001110561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 19.

Adding to 1210001110561 its reverse (1650111000121), we get a palindrome (2860112110682).

The spelling of 1210001110561 in words is "one trillion, two hundred ten billion, one million, one hundred ten thousand, five hundred sixty-one".