11020121309 has 2 divisors, whose sum is σ = 11020121310. Its totient is φ = 11020121308.

The previous prime is 11020121267. The next prime is 11020121323. The reversal of 11020121309 is 90312102011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9181855684 + 1838265625 = 95822^2 + 42875^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020121309 - 2³² = 6725154013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11020121389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510060654 + 5510060655.

It is an arithmetic number, because the mean of its divisors is an integer number (5510060655).

Almost surely, 2^11020121309 is an apocalyptic number.

It is an amenable number.

11020121309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020121309 is an equidigital number, since it uses as much as digits as its factorization.

11020121309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 11020121309 in words is "eleven billion, twenty million, one hundred twenty-one thousand, three hundred nine".