101221001111 has 2 divisors, whose sum is σ = 101221001112. Its totient is φ = 101221001110.

The previous prime is 101221001069. The next prime is 101221001143. The reversal of 101221001111 is 111100122101.

It is a strong prime.

It is an emirp because it is prime and its reverse (111100122101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101221001111 - 2¹⁰ = 101221000087 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 101221001092 and 101221001101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101221001311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610500555 + 50610500556.

It is an arithmetic number, because the mean of its divisors is an integer number (50610500556).

Almost surely, 2^101221001111 is an apocalyptic number.

101221001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221001111 is an equidigital number, since it uses as much as digits as its factorization.

101221001111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 101221001111 its reverse (111100122101), we get a palindrome (212321123212).

The spelling of 101221001111 in words is "one hundred one billion, two hundred twenty-one million, one thousand, one hundred eleven".