11211221101 has 2 divisors, whose sum is σ = 11211221102. Its totient is φ = 11211221100.

The previous prime is 11211221033. The next prime is 11211221137. The reversal of 11211221101 is 10112211211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9011704900 + 2199516201 = 94930^2 + 46899^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211221101 - 2⁷ = 11211220973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211221141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605610550 + 5605610551.

It is an arithmetic number, because the mean of its divisors is an integer number (5605610551).

Almost surely, 2^11211221101 is an apocalyptic number.

It is an amenable number.

11211221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211221101 is an equidigital number, since it uses as much as digits as its factorization.

11211221101 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 13.

Adding to 11211221101 its reverse (10112211211), we get a palindrome (21323432312).

The spelling of 11211221101 in words is "eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred one".