211122220121211 has 16 divisors (see below), whose sum is σ = 321710347691264. Its totient is φ = 120641156897184.

The previous prime is 211122220121149. The next prime is 211122220121231. The reversal of 211122220121211 is 112121022221112.

It is not a de Polignac number, because 211122220121211 - 2⁷ = 211122220121083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (211122220121231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22143276 + ... + 30208758.

It is an arithmetic number, because the mean of its divisors is an integer number (20106896730704).

Almost surely, 2^{211122220121211} is an apocalyptic number.

211122220121211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

211122220121211 is a deficient number, since it is larger than the sum of its proper divisors (110588127570053).

211122220121211 is a wasteful number, since it uses less digits than its factorization.

211122220121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9311970.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211122220121211 its reverse (112121022221112), we get a palindrome (323243242342323).

The spelling of 211122220121211 in words is "two hundred eleven trillion, one hundred twenty-two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred eleven".