1321826216817 has 16 divisors (see below), whose sum is σ = 1902478515840. Its totient is φ = 813838029312.

The previous prime is 1321826216807. The next prime is 1321826216903. The reversal of 1321826216817 is 7186126281231.

It is not a de Polignac number, because 1321826216817 - 2²⁰ = 1321825168241 is a prime.

It is a super-2 number, since 2×1321826216817² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321826216807) 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, 330289408 + ... + 330293409.

It is an arithmetic number, because the mean of its divisors is an integer number (118904907240).

Almost surely, 2^{1321826216817} is an apocalyptic number.

It is an amenable number.

1321826216817 is a deficient number, since it is larger than the sum of its proper divisors (580652299023).

1321826216817 is a wasteful number, since it uses less digits than its factorization.

1321826216817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660582872.

The product of its digits is 387072, while the sum is 48.

The spelling of 1321826216817 in words is "one trillion, three hundred twenty-one billion, eight hundred twenty-six million, two hundred sixteen thousand, eight hundred seventeen".