1321281284052 has 36 divisors (see below), whose sum is σ = 3192965537216. Its totient is φ = 425239950240.

The previous prime is 1321281284051. The next prime is 1321281284093. The reversal of 1321281284052 is 2504821821231.

It is a super-2 number, since 2×1321281284052² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321281284052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321281284051) 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, 65451724 + ... + 65471907.

Almost surely, 2^{1321281284052} is an apocalyptic number.

1321281284052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321281284052 is an abundant number, since it is smaller than the sum of its proper divisors (1871684253164).

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

1321281284052 is a wasteful number, since it uses less digits than its factorization.

1321281284052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130923696 (or 130923665 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The spelling of 1321281284052 in words is "one trillion, three hundred twenty-one billion, two hundred eighty-one million, two hundred eighty-four thousand, fifty-two".