1221010066705 has 32 divisors (see below), whose sum is σ = 1721859648768. Its totient is φ = 819464966400.

The previous prime is 1221010066663. The next prime is 1221010066753. The reversal of 1221010066705 is 5076600101221.

It is not a de Polignac number, because 1221010066705 - 2³³ = 1212420132113 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2279715 + ... + 2763895.

It is an arithmetic number, because the mean of its divisors is an integer number (53808114024).

Almost surely, 2^{1221010066705} is an apocalyptic number.

It is an amenable number.

1221010066705 is a deficient number, since it is larger than the sum of its proper divisors (500849582063).

1221010066705 is a wasteful number, since it uses less digits than its factorization.

1221010066705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487737.

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 1221010066705 its reverse (5076600101221), we get a palindrome (6297610167926).

The spelling of 1221010066705 in words is "one trillion, two hundred twenty-one billion, ten million, sixty-six thousand, seven hundred five".