1211002111111 has 8 divisors (see below), whose sum is σ = 1307100044880. Its totient is φ = 1115324738112.

The previous prime is 1211002111093. The next prime is 1211002111133. The reversal of 1211002111111 is 1111112001121.

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

It is not a de Polignac number, because 1211002111111 - 2⁹ = 1211002110599 is a prime.

It is a super-2 number, since 2×1211002111111² (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 = 1211002111091 and 1211002111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211002117111) 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, 105134206 + ... + 105145723.

It is an arithmetic number, because the mean of its divisors is an integer number (163387505610).

Almost surely, 2^{1211002111111} is an apocalyptic number.

1211002111111 is a deficient number, since it is larger than the sum of its proper divisors (96097933769).

1211002111111 is a wasteful number, since it uses less digits than its factorization.

1211002111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210280385.

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

Adding to 1211002111111 its reverse (1111112001121), we get a palindrome (2322114112232).

The spelling of 1211002111111 in words is "one trillion, two hundred eleven billion, two million, one hundred eleven thousand, one hundred eleven".