1321361506406 has 4 divisors (see below), whose sum is σ = 1982042259612. Its totient is φ = 660680753202.

The previous prime is 1321361506397. The next prime is 1321361506447. The reversal of 1321361506406 is 6046051631231.

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

It is a super-2 number, since 2×1321361506406² (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 1321361506406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330340376600 + ... + 330340376603.

It is an arithmetic number, because the mean of its divisors is an integer number (495510564903).

Almost surely, 2^{1321361506406} is an apocalyptic number.

1321361506406 is a deficient number, since it is larger than the sum of its proper divisors (660680753206).

1321361506406 is an equidigital number, since it uses as much as digits as its factorization.

1321361506406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660680753205.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 1321361506406 in words is "one trillion, three hundred twenty-one billion, three hundred sixty-one million, five hundred six thousand, four hundred six".