1011211220111 has 2 divisors, whose sum is σ = 1011211220112. Its totient is φ = 1011211220110.

The previous prime is 1011211220003. The next prime is 1011211220147. The reversal of 1011211220111 is 1110221121101.

It is a strong prime.

It is an emirp because it is prime and its reverse (1110221121101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011211220111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011211220191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505605610055 + 505605610056.

It is an arithmetic number, because the mean of its divisors is an integer number (505605610056).

Almost surely, 2^{1011211220111} is an apocalyptic number.

1011211220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011211220111 is an equidigital number, since it uses as much as digits as its factorization.

1011211220111 is an evil number, because the sum of its binary digits is even.

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

Adding to 1011211220111 its reverse (1110221121101), we get a palindrome (2121432341212).

The spelling of 1011211220111 in words is "one trillion, eleven billion, two hundred eleven million, two hundred twenty thousand, one hundred eleven".