1321216682 has 4 divisors (see below), whose sum is σ = 1981825026. Its totient is φ = 660608340.

The previous prime is 1321216681. The next prime is 1321216691. The reversal of 1321216682 is 2866121231.

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

It can be written as a sum of positive squares in only one way, i.e., 741418441 + 579798241 = 27229^2 + 24079^2 .

It is a super-2 number, since 2×1321216682² = 3491227041590178248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321216681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330304169 + ... + 330304172.

Almost surely, 2^1321216682 is an apocalyptic number.

1321216682 is a deficient number, since it is larger than the sum of its proper divisors (660608344).

1321216682 is an equidigital number, since it uses as much as digits as its factorization.

1321216682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660608343.

The product of its digits is 6912, while the sum is 32.

The square root of 1321216682 is about 36348.5444275283. The cubic root of 1321216682 is about 1097.2982405947.

The spelling of 1321216682 in words is "one billion, three hundred twenty-one million, two hundred sixteen thousand, six hundred eighty-two".