1216122661312 has 56 divisors (see below), whose sum is σ = 2751752694096. Its totient is φ = 528270471168.

The previous prime is 1216122661297. The next prime is 1216122661357. The reversal of 1216122661312 is 2131662216121.

It is a super-2 number, since 2×1216122661312² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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, 42976618 + ... + 43004905.

It is an arithmetic number, because the mean of its divisors is an integer number (49138440966).

Almost surely, 2^{1216122661312} is an apocalyptic number.

It is an amenable number.

1216122661312 is an abundant number, since it is smaller than the sum of its proper divisors (1535630032784).

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

1216122661312 is a wasteful number, since it uses less digits than its factorization.

1216122661312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85981565 (or 85981555 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

Adding to 1216122661312 its reverse (2131662216121), we get a palindrome (3347784877433).

The spelling of 1216122661312 in words is "one trillion, two hundred sixteen billion, one hundred twenty-two million, six hundred sixty-one thousand, three hundred twelve".