1321143890389 has 4 divisors (see below), whose sum is σ = 1332835429356. Its totient is φ = 1309452351424.

The previous prime is 1321143890371. The next prime is 1321143890393. The reversal of 1321143890389 is 9830983411231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 551239427025 + 769904463364 = 742455^2 + 877442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321143890389 is a prime.

It is a super-2 number, since 2×1321143890389² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321143890189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5845769314 + ... + 5845769539.

It is an arithmetic number, because the mean of its divisors is an integer number (333208857339).

Almost surely, 2^{1321143890389} is an apocalyptic number.

It is an amenable number.

1321143890389 is a deficient number, since it is larger than the sum of its proper divisors (11691538967).

1321143890389 is a wasteful number, since it uses less digits than its factorization.

1321143890389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11691538966.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 1321143890389 in words is "one trillion, three hundred twenty-one billion, one hundred forty-three million, eight hundred ninety thousand, three hundred eighty-nine".