1211122101 has 32 divisors (see below), whose sum is σ = 1871400960. Its totient is φ = 682424064.

The previous prime is 1211122097. The next prime is 1211122103. The reversal of 1211122101 is 1012211121.

It is not a de Polignac number, because 1211122101 - 2² = 1211122097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211122103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567805 + ... + 569933.

It is an arithmetic number, because the mean of its divisors is an integer number (58481280).

Almost surely, 2^1211122101 is an apocalyptic number.

It is an amenable number.

1211122101 is a deficient number, since it is larger than the sum of its proper divisors (660278859).

1211122101 is a wasteful number, since it uses less digits than its factorization.

1211122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211122101 is about 34801.1795920770. The cubic root of 1211122101 is about 1065.9315326091.

Adding to 1211122101 its reverse (1012211121), we get a palindrome (2223333222).

The spelling of 1211122101 in words is "one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred one".