1211201111211 has 48 divisors (see below), whose sum is σ = 2058514209024. Its totient is φ = 616845011328.

The previous prime is 1211201111147. The next prime is 1211201111243. The reversal of 1211201111211 is 1121111021121.

It is not a de Polignac number, because 1211201111211 - 2⁶ = 1211201111147 is a prime.

It is a super-2 number, since 2×1211201111211² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211201111261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2408121 + ... + 2867306.

It is an arithmetic number, because the mean of its divisors is an integer number (42885712688).

Almost surely, 2^{1211201111211} is an apocalyptic number.

1211201111211 is a deficient number, since it is larger than the sum of its proper divisors (847313097813).

1211201111211 is a wasteful number, since it uses less digits than its factorization.

1211201111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275508 (or 5275479 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211201111211 its reverse (1121111021121), we get a palindrome (2332312132332).

The spelling of 1211201111211 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred eleven thousand, two hundred eleven".