121260820866 has 16 divisors (see below), whose sum is σ = 246141368544. Its totient is φ = 39816985824.

The previous prime is 121260820801. The next prime is 121260820957. The reversal of 121260820866 is 668028062121.

It is a super-2 number, since 2×121260820866² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150821515 + ... + 150822318.

It is an arithmetic number, because the mean of its divisors is an integer number (15383835534).

Almost surely, 2^121260820866 is an apocalyptic number.

121260820866 is an abundant number, since it is smaller than the sum of its proper divisors (124880547678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121260820866 is a wasteful number, since it uses less digits than its factorization.

121260820866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301643905.

The product of its (nonzero) digits is 110592, while the sum is 42.

Adding to 121260820866 its reverse (668028062121), we get a palindrome (789288882987).

The spelling of 121260820866 in words is "one hundred twenty-one billion, two hundred sixty million, eight hundred twenty thousand, eight hundred sixty-six".