11221121012009 has 2 divisors, whose sum is σ = 11221121012010. Its totient is φ = 11221121012008.

The previous prime is 11221121011979. The next prime is 11221121012027. The reversal of 11221121012009 is 90021012112211.

It is a happy number.

11221121012009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7156844851984 + 4064276160025 = 2675228^2 + 2016005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221121012009 is a prime.

It is a super-2 number, since 2×11221121012009² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11221121012209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610560506004 + 5610560506005.

It is an arithmetic number, because the mean of its divisors is an integer number (5610560506005).

Almost surely, 2^{11221121012009} is an apocalyptic number.

It is an amenable number.

11221121012009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221121012009 is an equidigital number, since it uses as much as digits as its factorization.

11221121012009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 11221121012009 in words is "eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, twelve thousand, nine".