221121101011 has 2 divisors, whose sum is σ = 221121101012. Its totient is φ = 221121101010.

The previous prime is 221121100987. The next prime is 221121101057. The reversal of 221121101011 is 110101121122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221121101011 - 2¹⁵ = 221121068243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221121100982 and 221121101000.

It is not a weakly prime, because it can be changed into another prime (221121101711) 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, 110560550505 + 110560550506.

It is an arithmetic number, because the mean of its divisors is an integer number (110560550506).

Almost surely, 2^221121101011 is an apocalyptic number.

221121101011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121101011 is an equidigital number, since it uses as much as digits as its factorization.

221121101011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221121101011 its reverse (110101121122), we get a palindrome (331222222133).

The spelling of 221121101011 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, eleven".