1211000100101 has 16 divisors (see below), whose sum is σ = 1334796323328. Its totient is φ = 1089498312000.

The previous prime is 1211000100097. The next prime is 1211000100133. The reversal of 1211000100101 is 1010010001121.

It is a happy number.

It is not a de Polignac number, because 1211000100101 - 2² = 1211000100097 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 (1211000130101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2126555 + ... + 2635191.

It is an arithmetic number, because the mean of its divisors is an integer number (83424770208).

Almost surely, 2^{1211000100101} is an apocalyptic number.

1211000100101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211000100101 is a deficient number, since it is larger than the sum of its proper divisors (123796223227).

1211000100101 is a wasteful number, since it uses less digits than its factorization.

1211000100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510892.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1211000100101 its reverse (1010010001121), we get a palindrome (2221010101222).

The spelling of 1211000100101 in words is "one trillion, two hundred eleven billion, one hundred thousand, one hundred one".