861213288011121 has 12 divisors (see below), whose sum is σ = 1265059067135760. Its totient is φ = 564410968413720.

The previous prime is 861213288011099. The next prime is 861213288011123. The reversal of 861213288011121 is 121110882312168.

861213288011121 is a `hidden beast` number, since 8 + 6 + 121 + 328 + 80 + 1 + 1 + 121 = 666.

It is not a de Polignac number, because 861213288011121 - 2¹⁵ = 861213287978353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861213288011123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 810935298915 + ... + 810935299976.

It is an arithmetic number, because the mean of its divisors is an integer number (105421588927980).

Almost surely, 2^{861213288011121} is an apocalyptic number.

It is an amenable number.

861213288011121 is a deficient number, since it is larger than the sum of its proper divisors (403845779124639).

861213288011121 is a wasteful number, since it uses less digits than its factorization.

861213288011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621870598956 (or 1621870598953 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The spelling of 861213288011121 in words is "eight hundred sixty-one trillion, two hundred thirteen billion, two hundred eighty-eight million, eleven thousand, one hundred twenty-one".