1213321986 has 12 divisors (see below), whose sum is σ = 2628864342. Its totient is φ = 404440656.

The previous prime is 1213321957. The next prime is 1213321987. The reversal of 1213321986 is 6891233121.

It can be written as a sum of positive squares in only one way, i.e., 959078961 + 254243025 = 30969^2 + 15945^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1213321986.

It is not an unprimeable number, because it can be changed into a prime (1213321987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33703371 + ... + 33703406.

Almost surely, 2^1213321986 is an apocalyptic number.

1213321986 is an abundant number, since it is smaller than the sum of its proper divisors (1415542356).

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

1213321986 is a wasteful number, since it uses less digits than its factorization.

1213321986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67406785 (or 67406782 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1213321986 is about 34832.7717243403. The cubic root of 1213321986 is about 1066.5765290803.

The spelling of 1213321986 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, nine hundred eighty-six".