1211131101 has 32 divisors (see below), whose sum is σ = 1695028608. Its totient is φ = 768476160.

The previous prime is 1211131099. The next prime is 1211131111. The reversal of 1211131101 is 1011311121.

It is not a de Polignac number, because 1211131101 - 2¹ = 1211131099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211131111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1109566 + ... + 1110656.

It is an arithmetic number, because the mean of its divisors is an integer number (52969644).

Almost surely, 2^1211131101 is an apocalyptic number.

It is an amenable number.

1211131101 is a deficient number, since it is larger than the sum of its proper divisors (483897507).

1211131101 is a wasteful number, since it uses less digits than its factorization.

1211131101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341.

The product of its (nonzero) digits is 6, while the sum is 12.

The square root of 1211131101 is about 34801.3088977987. The cubic root of 1211131101 is about 1065.9341729595.

Adding to 1211131101 its reverse (1011311121), we get a palindrome (2222442222).

The spelling of 1211131101 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, one hundred one".