1221001212011 has 8 divisors (see below), whose sum is σ = 1409246095584. Its totient is φ = 1036210363200.

The previous prime is 1221001211981. The next prime is 1221001212031. The reversal of 1221001212011 is 1102121001221.

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 1221001212011 - 2¹⁰ = 1221001210987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221001212031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 863507930 + ... + 863509343.

It is an arithmetic number, because the mean of its divisors is an integer number (176155761948).

Almost surely, 2^{1221001212011} is an apocalyptic number.

1221001212011 is a deficient number, since it is larger than the sum of its proper divisors (188244883573).

1221001212011 is a wasteful number, since it uses less digits than its factorization.

1221001212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727017381.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221001212011 its reverse (1102121001221), we get a palindrome (2323122213232).

The spelling of 1221001212011 in words is "one trillion, two hundred twenty-one billion, one million, two hundred twelve thousand, eleven".