21220112113009 has 2 divisors, whose sum is σ = 21220112113010. Its totient is φ = 21220112113008.

The previous prime is 21220112113001. The next prime is 21220112113061. The reversal of 21220112113009 is 90031121102212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21128069654784 + 92042458225 = 4596528^2 + 303385^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220112113009 - 2³ = 21220112113001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220112113001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610056056504 + 10610056056505.

It is an arithmetic number, because the mean of its divisors is an integer number (10610056056505).

Almost surely, 2^{21220112113009} is an apocalyptic number.

It is an amenable number.

21220112113009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220112113009 is an equidigital number, since it uses as much as digits as its factorization.

21220112113009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 21220112113009 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, one hundred thirteen thousand, nine".