1201211111 has 2 divisors, whose sum is σ = 1201211112. Its totient is φ = 1201211110.

The previous prime is 1201211107. The next prime is 1201211119. The reversal of 1201211111 is 1111121021.

It is a weak prime.

It is an emirp because it is prime and its reverse (1111121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201211111 - 2² = 1201211107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201211092 and 1201211101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201211119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600605555 + 600605556.

It is an arithmetic number, because the mean of its divisors is an integer number (600605556).

Almost surely, 2^1201211111 is an apocalyptic number.

1201211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201211111 is an equidigital number, since it uses as much as digits as its factorization.

1201211111 is an evil number, because the sum of its binary digits is even.

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

The square root of 1201211111 is about 34658.4926244636. The cubic root of 1201211111 is about 1063.0159482808.

Adding to 1201211111 its reverse (1111121021), we get a palindrome (2312332132).

The spelling of 1201211111 in words is "one billion, two hundred one million, two hundred eleven thousand, one hundred eleven".