1211120101 has 4 divisors (see below), whose sum is σ = 1221838092. Its totient is φ = 1200402112.

The previous prime is 1211120093. The next prime is 1211120123. The reversal of 1211120101 is 1010211121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125417601 + 1085702500 = 11199^2 + 32950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211120101 - 2³ = 1211120093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211120501) 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 3 ways as a sum of consecutive naturals, for example, 5358826 + ... + 5359051.

It is an arithmetic number, because the mean of its divisors is an integer number (305459523).

Almost surely, 2^1211120101 is an apocalyptic number.

It is an amenable number.

1211120101 is a deficient number, since it is larger than the sum of its proper divisors (10717991).

1211120101 is a wasteful number, since it uses less digits than its factorization.

1211120101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717990.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1211120101 is about 34801.1508574070. The cubic root of 1211120101 is about 1065.9309458628.

Adding to 1211120101 its reverse (1010211121), we get a palindrome (2221331222).

The spelling of 1211120101 in words is "one billion, two hundred eleven million, one hundred twenty thousand, one hundred one".