1321326686 has 4 divisors (see below), whose sum is σ = 1981990032. Its totient is φ = 660663342.

The previous prime is 1321326641. The next prime is 1321326697. The reversal of 1321326686 is 6866231231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6866231231 = 331 ⋅20743901.

It is a super-2 number, since 2×1321326686² = 3491808422271485192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330331670 + ... + 330331673.

It is an arithmetic number, because the mean of its divisors is an integer number (495497508).

Almost surely, 2^1321326686 is an apocalyptic number.

1321326686 is a deficient number, since it is larger than the sum of its proper divisors (660663346).

1321326686 is an equidigital number, since it uses as much as digits as its factorization.

1321326686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660663345.

The product of its digits is 62208, while the sum is 38.

The square root of 1321326686 is about 36350.0575790466. The cubic root of 1321326686 is about 1097.3286932947.

The spelling of 1321326686 in words is "one billion, three hundred twenty-one million, three hundred twenty-six thousand, six hundred eighty-six".