1210111211111 has 4 divisors (see below), whose sum is σ = 1320121321224. Its totient is φ = 1100101101000.

The previous prime is 1210111211077. The next prime is 1210111211147. The reversal of 1210111211111 is 1111121110121.

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

It is not a de Polignac number, because 1210111211111 - 2²⁶ = 1210044102247 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 (1210111211411) 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, 55005055040 + ... + 55005055061.

It is an arithmetic number, because the mean of its divisors is an integer number (330030330306).

Almost surely, 2^{1210111211111} is an apocalyptic number.

1210111211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1210111211111 is a deficient number, since it is larger than the sum of its proper divisors (110010110113).

1210111211111 is a wasteful number, since it uses less digits than its factorization.

1210111211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110010110112.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1210111211111 its reverse (1111121110121), we get a palindrome (2321232321232).

The spelling of 1210111211111 in words is "one trillion, two hundred ten billion, one hundred eleven million, two hundred eleven thousand, one hundred eleven".