1321826216816 has 40 divisors (see below), whose sum is σ = 2927313354240. Its totient is φ = 566417121984.

The previous prime is 1321826216807. The next prime is 1321826216903. The reversal of 1321826216816 is 6186126281231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29756 + ... + 1626203.

It is an arithmetic number, because the mean of its divisors is an integer number (73182833856).

Almost surely, 2^{1321826216816} is an apocalyptic number.

1321826216816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321826216816 is an abundant number, since it is smaller than the sum of its proper divisors (1605487137424).

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

1321826216816 is a wasteful number, since it uses less digits than its factorization.

1321826216816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663101 (or 1663095 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The spelling of 1321826216816 in words is "one trillion, three hundred twenty-one billion, eight hundred twenty-six million, two hundred sixteen thousand, eight hundred sixteen".