1221513051986 has 8 divisors (see below), whose sum is σ = 1832372863500. Its totient is φ = 610722097488.

The previous prime is 1221513051881. The next prime is 1221513052021. The reversal of 1221513051986 is 6891503151221.

It can be written as a sum of positive squares in 2 ways, for example, as 1206317805625 + 15195246361 = 1098325^2 + 123269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17169881 + ... + 17240876.

Almost surely, 2^{1221513051986} is an apocalyptic number.

1221513051986 is a deficient number, since it is larger than the sum of its proper divisors (610859811514).

1221513051986 is a wasteful number, since it uses less digits than its factorization.

1221513051986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34428508.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 1221513051986 in words is "one trillion, two hundred twenty-one billion, five hundred thirteen million, fifty-one thousand, nine hundred eighty-six".