1211000020111 has 16 divisors (see below), whose sum is σ = 1400146067520. Its totient is φ = 1025900409600.

The previous prime is 1211000020103. The next prime is 1211000020121. The reversal of 1211000020111 is 1110200001121.

It is a cyclic number.

It is not a de Polignac number, because 1211000020111 - 2³ = 1211000020103 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 (1211000020121) 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, 1056061 + ... + 1880761.

It is an arithmetic number, because the mean of its divisors is an integer number (87509129220).

Almost surely, 2^{1211000020111} is an apocalyptic number.

1211000020111 is a deficient number, since it is larger than the sum of its proper divisors (189146047409).

1211000020111 is an equidigital number, since it uses as much as digits as its factorization.

1211000020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827154.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1211000020111 its reverse (1110200001121), we get a palindrome (2321200021232).

The spelling of 1211000020111 in words is "one trillion, two hundred eleven billion, twenty thousand, one hundred eleven".