1012211101261 has 2 divisors, whose sum is σ = 1012211101262. Its totient is φ = 1012211101260.

The previous prime is 1012211101243. The next prime is 1012211101397. The reversal of 1012211101261 is 1621011122101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 964532195236 + 47678906025 = 982106^2 + 218355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012211101261 - 2⁵ = 1012211101229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012211105261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506105550630 + 506105550631.

It is an arithmetic number, because the mean of its divisors is an integer number (506105550631).

Almost surely, 2^{1012211101261} is an apocalyptic number.

It is an amenable number.

1012211101261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012211101261 is an equidigital number, since it uses as much as digits as its factorization.

1012211101261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 1012211101261 its reverse (1621011122101), we get a palindrome (2633222223362).

The spelling of 1012211101261 in words is "one trillion, twelve billion, two hundred eleven million, one hundred one thousand, two hundred sixty-one".