1211101210111 has 8 divisors (see below), whose sum is σ = 1306604434464. Its totient is φ = 1115932499040.

The previous prime is 1211101210093. The next prime is 1211101210117. The reversal of 1211101210111 is 1110121011121.

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 1211101210111 - 2¹⁵ = 1211101177343 is a prime.

It is a super-2 number, since 2×1211101210111² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211101210091 and 1211101210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101210117) 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, 83620795 + ... + 83635276.

It is an arithmetic number, because the mean of its divisors is an integer number (163325554308).

Almost surely, 2^{1211101210111} is an apocalyptic number.

1211101210111 is a deficient number, since it is larger than the sum of its proper divisors (95503224353).

1211101210111 is a wasteful number, since it uses less digits than its factorization.

1211101210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167256641.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1211101210111 its reverse (1110121011121), we get a palindrome (2321222221232).

The spelling of 1211101210111 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred ten thousand, one hundred eleven".