101211111101 has 4 divisors (see below), whose sum is σ = 101530389372. Its totient is φ = 100891832832.

The previous prime is 101211111061. The next prime is 101211111119. The reversal of 101211111101 is 101111112101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101111112101 = 19 ⋅5321637479.

It can be written as a sum of positive squares in 2 ways, for example, as 5362047076 + 95849064025 = 73226^2 + 309595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101211111101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211111181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159638660 + ... + 159639293.

It is an arithmetic number, because the mean of its divisors is an integer number (25382597343).

Almost surely, 2^101211111101 is an apocalyptic number.

It is an amenable number.

101211111101 is a deficient number, since it is larger than the sum of its proper divisors (319278271).

101211111101 is an equidigital number, since it uses as much as digits as its factorization.

101211111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319278270.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 101211111101 its reverse (101111112101), we get a palindrome (202322223202).

The spelling of 101211111101 in words is "one hundred one billion, two hundred eleven million, one hundred eleven thousand, one hundred one".