101211101211111 has 4 divisors (see below), whose sum is σ = 134948134948152. Its totient is φ = 67474067474072.

The previous prime is 101211101211097. The next prime is 101211101211133. The reversal of 101211101211111 is 111112101112101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 101211101211111 - 2⁶ = 101211101211047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211101211911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16868516868516 + ... + 16868516868521.

It is an arithmetic number, because the mean of its divisors is an integer number (33737033737038).

Almost surely, 2^{101211101211111} is an apocalyptic number.

101211101211111 is a deficient number, since it is larger than the sum of its proper divisors (33737033737041).

101211101211111 is an equidigital number, since it uses as much as digits as its factorization.

101211101211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33737033737040.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 101211101211111 its reverse (111112101112101), we get a palindrome (212323202323212).

The spelling of 101211101211111 in words is "one hundred one trillion, two hundred eleven billion, one hundred one million, two hundred eleven thousand, one hundred eleven".