1231221219986 has 16 divisors (see below), whose sum is σ = 1900868634240. Its totient is φ = 597853835280.

The previous prime is 1231221219983. The next prime is 1231221220003. The reversal of 1231221219986 is 6899121221321.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231221219986.

It is not an unprimeable number, because it can be changed into a prime (1231221219983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63863636 + ... + 63882911.

It is an arithmetic number, because the mean of its divisors is an integer number (118804289640).

Almost surely, 2^{1231221219986} is an apocalyptic number.

1231221219986 is a deficient number, since it is larger than the sum of its proper divisors (669647414254).

1231221219986 is a wasteful number, since it uses less digits than its factorization.

1231221219986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127746689.

The product of its digits is 186624, while the sum is 47.

The spelling of 1231221219986 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, two hundred nineteen thousand, nine hundred eighty-six".