1221246744681 has 8 divisors (see below), whose sum is σ = 1630372068864. Its totient is φ = 813142958480.

The previous prime is 1221246744667. The next prime is 1221246744689. The reversal of 1221246744681 is 1864476421221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221246744681 - 2¹⁸ = 1221246482537 is a prime.

It is a super-2 number, since 2×1221246744681² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221246744681.

It is not an unprimeable number, because it can be changed into a prime (1221246744689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255381705 + ... + 255386486.

It is an arithmetic number, because the mean of its divisors is an integer number (203796508608).

Almost surely, 2^{1221246744681} is an apocalyptic number.

It is an amenable number.

1221246744681 is a deficient number, since it is larger than the sum of its proper divisors (409125324183).

1221246744681 is an equidigital number, since it uses as much as digits as its factorization.

1221246744681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510768991.

The product of its digits is 1032192, while the sum is 48.

The spelling of 1221246744681 in words is "one trillion, two hundred twenty-one billion, two hundred forty-six million, seven hundred forty-four thousand, six hundred eighty-one".