1211222220011 has 8 divisors (see below), whose sum is σ = 1282999919904. Its totient is φ = 1139503335040.

The previous prime is 1211222219983. The next prime is 1211222220023. The reversal of 1211222220011 is 1100222221121.

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 1211222220011 - 2²² = 1211218025707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211222220071) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14661320 + ... + 14743701.

It is an arithmetic number, because the mean of its divisors is an integer number (160374989988).

Almost surely, 2^{1211222220011} is an apocalyptic number.

1211222220011 is a deficient number, since it is larger than the sum of its proper divisors (71777699893).

1211222220011 is a wasteful number, since it uses less digits than its factorization.

1211222220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29407461.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1211222220011 its reverse (1100222221121), we get a palindrome (2311444441132).

The spelling of 1211222220011 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty thousand, eleven".