1211102021111 has 16 divisors (see below), whose sum is σ = 1257130100160. Its totient is φ = 1165364067840.

The previous prime is 1211102021093. The next prime is 1211102021117. The reversal of 1211102021111 is 1111202011121.

It is a cyclic number.

It is not a de Polignac number, because 1211102021111 - 2¹⁴ = 1211102004727 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 (1211102021117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11950991 + ... + 12051903.

It is an arithmetic number, because the mean of its divisors is an integer number (78570631260).

Almost surely, 2^{1211102021111} is an apocalyptic number.

1211102021111 is a deficient number, since it is larger than the sum of its proper divisors (46028079049).

1211102021111 is a wasteful number, since it uses less digits than its factorization.

1211102021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102346.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211102021111 its reverse (1111202011121), we get a palindrome (2322304032232).

The spelling of 1211102021111 in words is "one trillion, two hundred eleven billion, one hundred two million, twenty-one thousand, one hundred eleven".