20111101321 has 2 divisors, whose sum is σ = 20111101322. Its totient is φ = 20111101320.

The previous prime is 20111101223. The next prime is 20111101327. The reversal of 20111101321 is 12310111102.

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., 17413441600 + 2697659721 = 131960^2 + 51939^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111101321 - 2⁷ = 20111101193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111101327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055550660 + 10055550661.

It is an arithmetic number, because the mean of its divisors is an integer number (10055550661).

Almost surely, 2^20111101321 is an apocalyptic number.

It is an amenable number.

20111101321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111101321 is an equidigital number, since it uses as much as digits as its factorization.

20111101321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20111101321 its reverse (12310111102), we get a palindrome (32421212423).

The spelling of 20111101321 in words is "twenty billion, one hundred eleven million, one hundred one thousand, three hundred twenty-one".