21112033009 has 2 divisors, whose sum is σ = 21112033010. Its totient is φ = 21112033008.

The previous prime is 21112032983. The next prime is 21112033021. The reversal of 21112033009 is 90033021112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13516387600 + 7595645409 = 116260^2 + 87153^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112033009 - 2⁹ = 21112032497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112033079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556016504 + 10556016505.

It is an arithmetic number, because the mean of its divisors is an integer number (10556016505).

Almost surely, 2^21112033009 is an apocalyptic number.

It is an amenable number.

21112033009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112033009 is an equidigital number, since it uses as much as digits as its factorization.

21112033009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21112033009 in words is "twenty-one billion, one hundred twelve million, thirty-three thousand, nine".