1321157742804 has 48 divisors (see below), whose sum is σ = 3425333329600. Its totient is φ = 440371829088.

The previous prime is 1321157742803. The next prime is 1321157742829. The reversal of 1321157742804 is 4082477511231.

It is a happy number.

1321157742804 is a `hidden beast` number, since 1 + 3 + 211 + 5 + 7 + 7 + 428 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1321157742804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321157742803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3522342 + ... + 3879330.

Almost surely, 2^{1321157742804} is an apocalyptic number.

It is an amenable number.

1321157742804 is an abundant number, since it is smaller than the sum of its proper divisors (2104175586796).

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

1321157742804 is a wasteful number, since it uses less digits than its factorization.

1321157742804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391269 (or 391261 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 1321157742804 in words is "one trillion, three hundred twenty-one billion, one hundred fifty-seven million, seven hundred forty-two thousand, eight hundred four".