1211122021211 has 4 divisors (see below), whose sum is σ = 1212409080624. Its totient is φ = 1209834961800.

The previous prime is 1211122021199. The next prime is 1211122021271. The reversal of 1211122021211 is 1121202211121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211122021211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211122021211.

It is not an unprimeable number, because it can be changed into a prime (1211122021271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643528295 + ... + 643530176.

It is an arithmetic number, because the mean of its divisors is an integer number (303102270156).

Almost surely, 2^{1211122021211} is an apocalyptic number.

1211122021211 is a deficient number, since it is larger than the sum of its proper divisors (1287059413).

1211122021211 is an equidigital number, since it uses as much as digits as its factorization.

1211122021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287059412.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211122021211 its reverse (1121202211121), we get a palindrome (2332324232332).

The spelling of 1211122021211 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, twenty-one thousand, two hundred eleven".