1211121210211 has 16 divisors (see below), whose sum is σ = 1334409931008. Its totient is φ = 1090032012000.

The previous prime is 1211121210073. The next prime is 1211121210251. The reversal of 1211121210211 is 1120121211121.

It is a cyclic number.

It is not a de Polignac number, because 1211121210211 - 2²¹ = 1211119113059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211121210251) 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, 17104066 + ... + 17174728.

It is an arithmetic number, because the mean of its divisors is an integer number (83400620688).

Almost surely, 2^{1211121210211} is an apocalyptic number.

1211121210211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211121210211 is a deficient number, since it is larger than the sum of its proper divisors (123288720797).

1211121210211 is a wasteful number, since it uses less digits than its factorization.

1211121210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86202.

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

Adding to 1211121210211 its reverse (1120121211121), we get a palindrome (2331242421332).

The spelling of 1211121210211 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, two hundred eleven".