1012100212261 has 2 divisors, whose sum is σ = 1012100212262. Its totient is φ = 1012100212260.

The previous prime is 1012100212169. The next prime is 1012100212297. The reversal of 1012100212261 is 1622120012101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864360684100 + 147739528161 = 929710^2 + 384369^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012100212261 - 2⁷ = 1012100212133 is a prime.

It is a super-2 number, since 2×1012100212261² (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 (1012100212961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506050106130 + 506050106131.

It is an arithmetic number, because the mean of its divisors is an integer number (506050106131).

Almost surely, 2^{1012100212261} is an apocalyptic number.

It is an amenable number.

1012100212261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012100212261 is an equidigital number, since it uses as much as digits as its factorization.

1012100212261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1012100212261 its reverse (1622120012101), we get a palindrome (2634220224362).

The spelling of 1012100212261 in words is "one trillion, twelve billion, one hundred million, two hundred twelve thousand, two hundred sixty-one".