1321693284261 has 16 divisors (see below), whose sum is σ = 2052008982144. Its totient is φ = 741003242304.

The previous prime is 1321693284253. The next prime is 1321693284287. The reversal of 1321693284261 is 1624823961231.

It is not a de Polignac number, because 1321693284261 - 2³ = 1321693284253 is a prime.

It is a super-2 number, since 2×1321693284261² (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 1321693284261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321693264261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593751486 + ... + 593753711.

It is an arithmetic number, because the mean of its divisors is an integer number (128250561384).

Almost surely, 2^{1321693284261} is an apocalyptic number.

It is an amenable number.

1321693284261 is a deficient number, since it is larger than the sum of its proper divisors (730315697883).

1321693284261 is a wasteful number, since it uses less digits than its factorization.

1321693284261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187505260.

The product of its digits is 746496, while the sum is 48.

The spelling of 1321693284261 in words is "one trillion, three hundred twenty-one billion, six hundred ninety-three million, two hundred eighty-four thousand, two hundred sixty-one".