1211011021111 has 4 divisors (see below), whose sum is σ = 1211065084800. Its totient is φ = 1210956957424.

The previous prime is 1211011021069. The next prime is 1211011021117. The reversal of 1211011021111 is 1111201101121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211011021111 - 2¹¹ = 1211011019063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211011021091 and 1211011021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211011021117) 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, 26998231 + ... + 27043048.

It is an arithmetic number, because the mean of its divisors is an integer number (302766271200).

Almost surely, 2^{1211011021111} is an apocalyptic number.

1211011021111 is a deficient number, since it is larger than the sum of its proper divisors (54063689).

1211011021111 is an equidigital number, since it uses as much as digits as its factorization.

1211011021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54063688.

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

Adding to 1211011021111 its reverse (1111201101121), we get a palindrome (2322212122232).

The spelling of 1211011021111 in words is "one trillion, two hundred eleven billion, eleven million, twenty-one thousand, one hundred eleven".