21211112002009 has 4 divisors (see below), whose sum is σ = 21211121386000. Its totient is φ = 21211102618020.

The previous prime is 21211112001991. The next prime is 21211112002013. The reversal of 21211112002009 is 90020021111212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21211112002009 - 2⁵ = 21211112001977 is a prime.

It is a super-2 number, since 2×21211112002009² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211112002109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001254 + ... + 6589744.

It is an arithmetic number, because the mean of its divisors is an integer number (5302780346500).

Almost surely, 2^{21211112002009} is an apocalyptic number.

It is an amenable number.

21211112002009 is a deficient number, since it is larger than the sum of its proper divisors (9383991).

21211112002009 is an equidigital number, since it uses as much as digits as its factorization.

21211112002009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9383990.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21211112002009 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, two thousand, nine".