1211020010111 has 64 divisors (see below), whose sum is σ = 1397981952000. Its totient is φ = 1042033766400.

The previous prime is 1211020010027. The next prime is 1211020010119. The reversal of 1211020010111 is 1110100201121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211020010111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211020010092 and 1211020010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211020010119) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 286223366 + ... + 286227596.

It is an arithmetic number, because the mean of its divisors is an integer number (21843468000).

Almost surely, 2^{1211020010111} is an apocalyptic number.

1211020010111 is a deficient number, since it is larger than the sum of its proper divisors (186961941889).

1211020010111 is a wasteful number, since it uses less digits than its factorization.

1211020010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1211020010111 its reverse (1110100201121), we get a palindrome (2321120211232).

The spelling of 1211020010111 in words is "one trillion, two hundred eleven billion, twenty million, ten thousand, one hundred eleven".