1211211112011 has 32 divisors (see below), whose sum is σ = 1623265163520. Its totient is φ = 803331333504.

The previous prime is 1211211111953. The next prime is 1211211112019. The reversal of 1211211112011 is 1102111121121.

It is not a de Polignac number, because 1211211112011 - 2⁹ = 1211211111499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211211112019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1084342425 + ... + 1084343541.

It is an arithmetic number, because the mean of its divisors is an integer number (50727036360).

Almost surely, 2^{1211211112011} is an apocalyptic number.

1211211112011 is a deficient number, since it is larger than the sum of its proper divisors (412054051509).

1211211112011 is a wasteful number, since it uses less digits than its factorization.

1211211112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3275.

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

Adding to 1211211112011 its reverse (1102111121121), we get a palindrome (2313322233132).

The spelling of 1211211112011 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twelve thousand, eleven".