1211020112111 has 8 divisors (see below), whose sum is σ = 1294240297680. Its totient is φ = 1129131449728.

The previous prime is 1211020112089. The next prime is 1211020112153. The reversal of 1211020112111 is 1112110201121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211020112111 - 2¹⁸ = 1211019849967 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 (1211020112011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332878916 + ... + 332882553.

It is an arithmetic number, because the mean of its divisors is an integer number (161780037210).

Almost surely, 2^{1211020112111} is an apocalyptic number.

1211020112111 is a deficient number, since it is larger than the sum of its proper divisors (83220185569).

1211020112111 is a wasteful number, since it uses less digits than its factorization.

1211020112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665761593.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211020112111 its reverse (1112110201121), we get a palindrome (2323130313232).

It can be divided in two parts, 12110201121 and 11, that multiplied together give a palindrome (133212212331).

The spelling of 1211020112111 in words is "one trillion, two hundred eleven billion, twenty million, one hundred twelve thousand, one hundred eleven".