1211013101 has 4 divisors (see below), whose sum is σ = 1213810332. Its totient is φ = 1208215872.

The previous prime is 1211013091. The next prime is 1211013103. The reversal of 1211013101 is 1013101121.

It is a happy number.

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 734464201 + 476548900 = 27101^2 + 21830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211013101 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 (1211013103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1397966 + ... + 1398831.

It is an arithmetic number, because the mean of its divisors is an integer number (303452583).

Almost surely, 2^1211013101 is an apocalyptic number.

It is an amenable number.

1211013101 is a deficient number, since it is larger than the sum of its proper divisors (2797231).

1211013101 is an equidigital number, since it uses as much as digits as its factorization.

1211013101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797230.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1211013101 is about 34799.6135179688. The cubic root of 1211013101 is about 1065.8995539940.

Adding to 1211013101 its reverse (1013101121), we get a palindrome (2224114222).

It can be divided in two parts, 121 and 1013101, that multiplied together give a palindrome (122585221).

The spelling of 1211013101 in words is "one billion, two hundred eleven million, thirteen thousand, one hundred one".