1321942191361 has 16 divisors (see below), whose sum is σ = 1459427716800. Its totient is φ = 1187361964800.

The previous prime is 1321942191301. The next prime is 1321942191377. The reversal of 1321942191361 is 1631912491231.

It is not a de Polignac number, because 1321942191361 - 2²⁵ = 1321908636929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321942191301) 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, 782170 + ... + 1804348.

It is an arithmetic number, because the mean of its divisors is an integer number (91214232300).

Almost surely, 2^{1321942191361} is an apocalyptic number.

1321942191361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321942191361 is a deficient number, since it is larger than the sum of its proper divisors (137485525439).

1321942191361 is a wasteful number, since it uses less digits than its factorization.

1321942191361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023600.

The product of its digits is 69984, while the sum is 43.

The spelling of 1321942191361 in words is "one trillion, three hundred twenty-one billion, nine hundred forty-two million, one hundred ninety-one thousand, three hundred sixty-one".