1321815471016 has 8 divisors (see below), whose sum is σ = 2478404008170. Its totient is φ = 660907735504.

The previous prime is 1321815471013. The next prime is 1321815471059. The reversal of 1321815471016 is 6101745181231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1224240454116 + 97575016900 = 1106454^2 + 312370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1321815471016² (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 1321815471016.

It is not an unprimeable number, because it can be changed into a prime (1321815471013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82613466931 + ... + 82613466946.

Almost surely, 2^{1321815471016} is an apocalyptic number.

It is an amenable number.

1321815471016 is a deficient number, since it is larger than the sum of its proper divisors (1156588537154).

1321815471016 is a wasteful number, since it uses less digits than its factorization.

1321815471016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165226933883 (or 165226933879 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 1321815471016 in words is "one trillion, three hundred twenty-one billion, eight hundred fifteen million, four hundred seventy-one thousand, sixteen".