1211100210111 has 8 divisors (see below), whose sum is σ = 1761600305664. Its totient is φ = 734000127320.

The previous prime is 1211100210031. The next prime is 1211100210139. The reversal of 1211100210111 is 1110120011121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211100210111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100210511) 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, 18350003151 + ... + 18350003216.

It is an arithmetic number, because the mean of its divisors is an integer number (220200038208).

Almost surely, 2^{1211100210111} is an apocalyptic number.

1211100210111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211100210111 is a deficient number, since it is larger than the sum of its proper divisors (550500095553).

1211100210111 is a wasteful number, since it uses less digits than its factorization.

1211100210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36700006381.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1211100210111 its reverse (1110120011121), we get a palindrome (2321220221232).

The spelling of 1211100210111 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred ten thousand, one hundred eleven".