1211100222101 has 32 divisors (see below), whose sum is σ = 1517119365888. Its totient is φ = 939237949440.

The previous prime is 1211100222089. The next prime is 1211100222109. The reversal of 1211100222101 is 1012220011121.

It is not a de Polignac number, because 1211100222101 - 2³⁸ = 936222315157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100222109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17043221 + ... + 17114133.

It is an arithmetic number, because the mean of its divisors is an integer number (47409980184).

Almost surely, 2^{1211100222101} is an apocalyptic number.

1211100222101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211100222101 is a deficient number, since it is larger than the sum of its proper divisors (306019143787).

1211100222101 is a wasteful number, since it uses less digits than its factorization.

1211100222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71981.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211100222101 its reverse (1012220011121), we get a palindrome (2223320233222).

The spelling of 1211100222101 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twenty-two thousand, one hundred one".