1261121000212 has 12 divisors (see below), whose sum is σ = 2209649894676. Its totient is φ = 629792458880.

The previous prime is 1261121000173. The next prime is 1261121000221. The reversal of 1261121000212 is 2120001211621.

It can be written as a sum of positive squares in 2 ways, for example, as 839873270916 + 421247729296 = 916446^2 + 649036^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1261121000212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192006613 + ... + 192013180.

It is an arithmetic number, because the mean of its divisors is an integer number (184137491223).

Almost surely, 2^{1261121000212} is an apocalyptic number.

It is an amenable number.

1261121000212 is a deficient number, since it is larger than the sum of its proper divisors (948528894464).

1261121000212 is a wasteful number, since it uses less digits than its factorization.

1261121000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384020618 (or 384020616 counting only the distinct ones).

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

Adding to 1261121000212 its reverse (2120001211621), we get a palindrome (3381122211833).

The spelling of 1261121000212 in words is "one trillion, two hundred sixty-one billion, one hundred twenty-one million, two hundred twelve", and thus it is an aban number.