1211221211011 has 8 divisors (see below), whose sum is σ = 1384640478464. Its totient is φ = 1037898860040.

The previous prime is 1211221211003. The next prime is 1211221211077. The reversal of 1211221211011 is 1101121221121.

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

It is not a de Polignac number, because 1211221211011 - 2³ = 1211221211003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211221211311) 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, 24202335 + ... + 24252328.

It is an arithmetic number, because the mean of its divisors is an integer number (173080059808).

Almost surely, 2^{1211221211011} is an apocalyptic number.

1211221211011 is a deficient number, since it is larger than the sum of its proper divisors (173419267453).

1211221211011 is an equidigital number, since it uses as much as digits as its factorization.

1211221211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48458241.

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

Adding to 1211221211011 its reverse (1101121221121), we get a palindrome (2312342432132).

The spelling of 1211221211011 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, eleven".